Supplementary Table 1 : List of clusters documenting the iAS events found by the semi-automatic search procedure.
Each cluster documenting one or more iAS events is represented by one sequence of the cluster (ID sequence). This ID sequence can be used as an entrance key for visualizing the alignment on the genomic DNA of either the ESTs or the ASSETs sequences making up these clusters. The visual inspection is accessible through a graphical interface (http://www.genoscope.cns.fr/cgi-bin/ggb/splicing_human/gbrowse/Human).  
Abbreviations: EC, exon cassette; 5' ASS, alternative 5’ splice site; 3' ASS, alternative 3’ splice site; RI, retained intron.  

List of clusters documenting the 8 iEC type of events found within space S>9 of the control library
ID sequence	Nb of iEC type of events	Nb of new iEC type of events	
KX0AAA15YN08	1	1	
KX0AAA34YP14	1	1	
KX0AAA17YM07	1	1	
KX0AAA29YI09	1	1	
KX0AAA6YB19	1	0	
KX0AAA28YG14	1	1	
KX0AAA15YE19	1	1	
KX0AAA29YO15	1	1	

List of clusters documenting the 20 iAS events found within space S2-9 of the control library
ID sequence	Nb of iAS events	Type of events	Nb of new iAS events	
KX0AAA40YN04	1	3' ASS	1	
KX0AAA5YC17	1	3' ASS	1	
KX0AAA29YH12	1	EC	0	
KX0AAA29YA16	1	5' ASS	0	
KX0AAA37YJ24	1	EC	1	
KX0AAA24YF22	2	EC;  3' ASS	1	
KX0AAA29YK24	2	5' ASS; EC	2	
KX0AAA41YJ05	1	EC	1	
KX0AAA28YA09	1	5' ASS	0	
KX0AAA38YE24	1	RI	1	
KX0AAA33YM24	1	EC	1	
KX0AAA29YA23	1	EC	1	
KX0AAA18YA15	1	3' ASS	0	
KX0AAA32YN24	1	EC	1	
KX0AAA11YA01	1	3' ASS	1	
KX0AAA32YI02	1	3' ASS	1	
KX0AAA7YG19	1	EC	1	
KX0AAA34YA04	1	EC	1	

List of clusters documenting the 55 iEC type of events found within space S>9 of the AS library
ID sequence	Nb of iEC type of events	Nb of new iEC type of events	
KX0ABA24YD24	1	1	
KX0ABA28YB23	2	2	
KX0ABA9YB13	2	2	
KX0ABA2YL08	5	5	
KX0ABA4YF21	1	0	
KX0ABA37YG14	1	1	
KX0ABA7YF16	2	1	
KX0ABA32YA01	1	1	
KX0ABA21YD15	1	1	
KX0ABA30YK19	2	2	
KX0ABA42YO03	4	4	
KX0ABA22YM07	1	0	
KX0ABA10YL13	2	1	
KX0ABA22YL06	1	1	
KX0ABA39YJ24	1	1	
KX0ABA29YK19	1	1	
KX0ABA12YD20	2	2	
KX0ABA24YG21	1	1	
KX0ABA22YK24	2	2	
KX0ABA6YM10	1	0	
KX0ABA6YB22	2	2	
KX0ABA37YG13	1	1	
KX0ABA20YM09	1	0	
KX0ABA32YD14	1	0	
KX0ABA39YA15	1	0	
KX0ABA3YA16	1	1	
KX0ABA16YH19	1	1	
KX0ABA12YA19	1	1	
KX0ABA6YG18	2	1	
KX0ABA17YN10	1	0	
KX0ABA16YE04	1	1	
KX0ABA15YJ07	1	1	
KX0ABA35YC04	1	1	
KX0ABA35YL11	1	1	
KX0ABA19YL24	1	1	
KX0ABA24YM03	1	1	
KX0ABA44YO19	2	0	
KX0ABA14YN16	1	1	

List of clusters documenting the 248 iAS events found within space S2-9 of the AS library
ID sequence	Nb of iAS events	Type of events	Nb of new iAS events	
KX0ABA5YN19	2	EC (2X)	2	
KX0ABA44YD16	3	EC (2X); 3' ASS	1	
KX0ABA37YI15	1	EC	1	
KX0ABA23YH05	3	EC; 3' ASS (2X)	2	
KX0ABA43YG08	1	EC	1	
KX0ABA5YH04	1	5' ASS	1	
KX0ABA14YG23	2	3' ASS; EC	2	
KX0ABA36YK06	2	EC (2X)	2	
KX0ABA39YC16	2	EC (2X)	1	
KX0ABA36YK20	2	5' ASS (2X) 	2	
KX0ABA33YK23	1	RI	1	
KX0ABA17YM05	4	5' ASS (3X); EC 	1	
KX0ABA35YP07	1	3' ASS	1	
KX0ABA33YP16	1	EC	1	
KX0ABA10YN10	1	5' ASS 	1	
KX0ABA5YO22	1	EC	1	
KX0ABA6YG14	1	3' ASS	0	
KX0ABA20YG14	2	EC; 3' ASS	1	
KX0ABA7YG18	1	EC	0	
KX0ABA29YC01	1	3' ASS	1	
KX0ABA9YI03	1	RI	1	
KX0ABA11YL19	1	3' ASS	1	
KX0ABA43YI19	1	5' ASS	1	
KX0ABA11YK19	1	5' ASS	1	
KX0ABA35YO21	1	EC	1	
KX0ABA12YD15	2	EC; 3' ASS	1	
KX0ABA42YM12	1	3' ASS	0	
KX0ABA8YA20	2	EC (2X)	2	
KX0ABA25YB15	1	EC	1	
KX0ABA15YB24	1	RI	1	
KX0ABA14YF12	1	EC	1	
KX0ABA32YK20	1	EC	1	
KX0ABA31YG19	1	EC	1	
KX0ABA2YM01	3	EC (2X); 3' ASS	3	
KX0ABA7YC19	4	EC; 5’ ASS & 3’ ASS (2X)	2	
KX0ABA25YK10	1	5' ASS	1	
KX0ABA7YE03	1	5' ASS	1	
KX0ABA2YA10	2	EC; 3' ASS	1	
KX0ABA12YO24	1	EC	1	
KX0ABA5YK20	1	EC	0	
KX0ABA16YJ18	1	EC	1	
KX0ABA7YF23	1	EC	0	
KX0ABA34YG19	1	EC	1	
KX0ABA10YL03	1	3' ASS	0	
KX0ABA9YC18	1	EC	1	
KX0ABA36YB02	3	EC; 3' ASS (2X)	3	
KX0ABA36YJ07	1	EC	1	
KX0ABA28YA02	1	5' ASS	1	
KX0ABA27YC10	1	3' ASS	1	
KX0ABA14YP15	1	complex	1	
KX0ABA15YJ09	1	split	1	
KX0ABA17YA11	1	5' ASS	1	
KX0ABA35YG05	2	RI; 3' ASS	2	
KX0ABA15YE11	2	EC; 3' ASS	2	
KX0ABA36YP13	1	EC	0	
KX0ABA11YP13	1	EC	1	
KX0ABA18YC13	1	EC	1	
KX0ABA6YP20	2	EC; 3' ASS	2	
KX0ABA13YP05	1	EC	1	
KX0ABA35YK15	1	EC	1	
KX0ABA2YN17	1	split	1	
KX0ABA14YF11	1	EC	1	
KX0ABA26YI04	1	EC	1	
KX0ABA25YG13	2	EC (2X)	2	
KX0ABA35YH22	1	RI	1	
KX0ABA23YK06	1	EC	1	
KX0ABA33YD12	2	5’ ASS & 3’ ASS	1	
KX0ABA31YK04	2	EC (2X)	2	
KX0ABA41YC04	1	5' ASS	1	
KX0ABA19YD09	1	EC	0	
KX0ABA39YE21	1	EC	1	
KX0ABA44YM09	1	RI	1	
KX0ABA2YI03	1	EC	1	
KX0ABA9YA03	2	EC; 5' ASS	1	
KX0ABA11YP15	2	EC; 3' ASS	1	
KX0ABA13YD07	2	RI; 3' ASS	2	
KX0ABA26YM09	1	EC	1	
KX0ABA24YB12	1	EC	1	
KX0ABA36YI23	2	EC; complex	2	
KX0ABA13YG08	1	EC	1	
KX0ABA21YK18	1	5' ASS	0	
KX0ABA1YO02	1	EC	1	
KX0ABA23YP07	2	EC (2X)	2	
KX0ABA7YE23	1	split	1	
KX0ABA26YE20	1	EC	1	
KX0ABA33YG11	1	RI	1	
KX0ABA21YL06	1	5' ASS	1	
KX0ABA18YA22	2	5' ASS (2X)	1	
KX0ABA19YG08	1	EC	1	
KX0ABA23YO09	1	EC	1	
KX0ABA13YJ15	2	EC; 3' ASS	2	
KX0ABA41YI06	1	RI	0	
KX0ABA34YL01	1	EC	1	
KX0ABA28YH23	1	5' ASS	0	
KX0ABA20YL05	2	EC; 3' ASS	2	
KX0ABA21YI14	1	3' ASS	1	
KX0ABA17YB04	1	3' ASS	1	
KX0ABA4YK22	1	EC	1	
KX0ABA7YD03	1	EC	1	
KX0ABA19YB06	2	3' ASS (2X)	2	
KX0ABA24YK22	1	RI	1	
KX0ABA31YC01	1	5' ASS	1	
KX0ABA15YF07	1	EC	1	
KX0ABA13YE06	1	EC	0	
KX0ABA36YG09	1	EC	0	
KX0ABA38YN19	1	EC	0	
KX0ABA25YB07	1	3' ASS	1	
KX0ABA26YB02	1	EC	1	
KX0ABA28YB07	1	5' ASS	0	
KX0ABA32YH12	2	EC; 3' ASS	2	
KX0ABA35YM19	2	EC (2X)	2	
KX0ABA9YN22	1	EC	1	
KX0ABA23YB22	1	3' ASS	1	
KX0ABA15YB12	1	EC	1	
KX0ABA3YH03	1	EC	1	
KX0ABA12YL08	1	EC	1	
KX0ABA37YL15	1	EC	0	
KX0ABA41YM16	1	EC	1	
KX0ABA4YN12	1	5' ASS	1	
KX0ABA15YF04	1	3' ASS	1	
KX0ABA35YB16	1	EC	1	
KX0ABA16YL16	1	3' ASS	1	
KX0ABA4YA09	3	EC (2X); 5' ASS	1	
KX0ABA21YC13	1	EC	1	
KX0ABA1YB22	1	RI	1	
KX0ABA39YP01	1	EC	1	
KX0ABA4YC23	1	EC	0	
KX0ABA26YN02	1	EC	1	
KX0ABA24YH03	1	RI	1	
KX0ABA41YC05	2	EC (2X)	1	
KX0ABA21YM21	1	3' ASS	1	
KX0ABA42YG09	1	3' ASS	1	
KX0ABA26YO08	1	EC	1	
KX0ABA20YO20	2	EC; 3' ASS	2	
KX0ABA42YK22	1	EC	1	
KX0ABA29YM17	1	EC	1	
KX0ABA18YG16	1	EC	1	
KX0ABA10YN23	2	EC; 5' ASS	2	
KX0ABA33YG07	1	EC	0	
KX0ABA22YN11	1	5' ASS	1	
KX0ABA1YH23	1	EC	1	
KX0ABA37YI20	1	3' ASS	1	
KX0ABA26YK22	1	EC	1	
KX0ABA3YB04	1	EC	1	
KX0ABA30YB07	1	EC	1	
KX0ABA40YO01	1	EC	1	
KX0ABA7YL19	1	5' ASS	1	
KX0ABA28YB22	1	3' ASS	1	
KX0ABA5YD10	1	EC	1	
KX0ABA1YE04	1	EC	1	
KX0ABA12YI23	2	EC; 3' ASS	2	
KX0ABA40YA23	1	3' ASS	1	
KX0ABA14YE18	1	EC	1	
KX0ABA34YE08	1	EC	1	
KX0ABA25YM17	1	EC	1	
KX0ABA23YM24	1	RI	1	
KX0ABA14YD14	1	EC	1	
KX0ABA35YB13	1	RI	1	
KX0ABA14YB23	1	5' ASS	1	
KX0ABA38YP13	1	3' ASS	1	
KX0ABA39YO09	1	RI	1	
KX0ABA13YE20	1	RI	1	
KX0ABA19YG16	1	5' ASS	1	
KX0ABA16YC11	1	RI	1	
KX0ABA2YP23	1	EC	1	
KX0ABA32YO10	1	EC	1	
KX0ABA13YJ13	1	3' ASS	1	
KX0ABA21YD17	1	3' ASS	1	
KX0ABA35YG02	1	EC	0	
KX0ABA44YF13	1	EC	1	
KX0ABA34YP14	1	EC	1	
KX0ABA17YC20	1	EC	1	
KX0ABA13YC12	2	5' ASS & 3' ASS 	1	
KX0ABA36YG08	1	EC	1	
KX0ABA17YN01	1	EC	1	
KX0ABA18YJ06	1	3' ASS	1	
KX0ABA37YJ03	2	EC; 5' ASS	2	
KX0ABA31YD23	1	EC	1	
KX0ABA14YG20	1	EC	1	
KX0ABA21YH08	1	EC	1	
KX0ABA24YJ01	1	EC	0	
KX0ABA22YA07	1	5' ASS	1	
KX0ABA43YI21	1	3' ASS	1	
KX0ABA2YH14	1	EC	1	
KX0ABA35YH11	1	3' ASS	1	
KX0ABA44YG11	1	RI	1	
KX0ABA7YM21	1	5' ASS	1	
KX0ABA21YO16	1	3' ASS	1	
KX0ABA39YJ17	1	3' ASS	1	
KX0ABA9YG05	1	5' ASS	1	
KX0ABA37YM21	1	EC	0	
KX0ABA44YE14	1	3' ASS	1	
KX0ABA41YJ16	1	EC	1	
KX0ABA36YO02	1	EC	1	
KX0ABA11YP07	1	EC	1	
KX0ABA18YN14	1	3' ASS	1	
KX0ABA38YB01	1	EC	1	
KX0ABA21YK07	1	EC	1	
KX0ABA1YI20	2	EC; 3' ASS	1