Table 1.

Numbers of Ta-1 Inserts Collected and Fractions of Polymorphic Inserts

		Cloning
		Druze	Biaka	Chinese	Melanesian	Total	Database^a	Total^b
Clones collected		1344	1576	1851	1980	6751	—	—
Clones sequenced		613	156	253	234	1256	—	—
Number of different Ta-1 inserts		167	58	35	17	277	67	344
Flanking sequences located in database		142	52	26	12	232	67	299
	Tested by PCR	116	28	21	9	174	43	217
	% Polymorphic	52%	75%	71%	100%	60%	72%	62%
Insertion sites occupied in database		102	19	13	4	138	67	205
	Tested by PCR	86	14	12	2	114	43	157
	% Polymorphic	38%	57%	50%	100%	43%	72%	51%
Insertion sites empty in database		40	33	13	8	94	—	94
	Tested by PCR	29	14	9	7	59	—	59
	% Polymorphic	90%	93%	100%	100%	93%	—	93%
Flanking sequences not located in database		25	6	9	5	45	—	45
Flanks are repeated DNA						17
Flanks not present in db						28
	Tested by PCR^c	16	2	4	0	22	—	22
	% Polymorphic	50%	0%	25%	—	41%	—	41%

↵a Elements from the database that were missed by cloning but retrieved by a BLAST search.
↵b Total number of Ta-1 inserts including cloning and database search.
↵c The polymorphism of these elements was tested with a single PCR using only the flanking primer cognate to the 3′ flanking sequence of the inserts.

The Insertional History of an Active Family of L1 Retrotransposons in Humans