Table A: List of forward (f) and reverse (r) oligonucleotides used for PCRs

Name	Purposea	Oligonucleotide sequence 	
InvPCR1_f	Characterization of the transposed copies	5’-GTCATCTCACCTTGCTCCTGCCGA-3’	
InvPCR1_r	(inverted PCR)	5’-CAAACTTAGCCAGAGTTCCAACGCCC-3’	
InvPCR2_f		5’-AAACATCGCATCGAGCGAGCACGTA-3’	
InvPCR2_r		5’-CCCCCTCAGGCCAGCTTTTTC-3’	
			
MusDchr10q22_f	Characterization of the transposed copies	5’-CTGGCCCACAGTGGAACTAA-3’	
MusDchr20p12_f	(direct PCR)	5’-GCAGGGAGCCAAGTGATAAAAAC-3’	
MusDchr5q23_f		5’-GGGGGCCGATATAACTTCTA-3’	
MusDchr12p13_f		5’-CCATTACTTCAAAGTATCCATCTT-3’	
MusD_int_r		5’-GGCACTCCTCCTGAGATACC-3’	
ETn chr6q22_f		5’-AATCCTTGTAAAAATACAGCACA-3’	
ETn chr8q24_f		5’-ATGAGAGAGGAGAGGGGCAG-3’	
ETn chr13q34_f		5’-AACATAAGGTGTAGGCTGGG-3’	
ETn chr6p22_f		5’-TTTGGGGGGTTTTGAGTTTG-3’	
ETn_int_r		5’-CCAGCGTTGGGTTAGCAC-3’	
			
MusDLTR_f	Construction of MusD expression vectors	5’-ATACAGAGCTCGTTTAGTGAACCGTGAGCTTTGATCAGAATGAATTTG-3’	
MusDLTR_r		5’-ATACACTCGAGCGCCAAAATGTTGCGGC-3’	
			
ETnLTR_f	Construction of the marked ETn elements	5’-ATACAGAGCTCGTTTAGTGAACCGTGAGCCTTGATCAGAGTAACTG-3’	
ETnLTR_r		5’-ATACAGTCGACCGCCAAAATGTTGCGGCCG-3’	
ETnI_f1		5’-AGCTCGTTTAGTGAACCGTGAGCCTTGATCAGAGTAACTG-3’	
ETnI_r1		5’-GAGCCCTGCATTGACTCAAA-3’	
ETnI_f2		5’-CGGGCAATTTTTTCACAACA-3’	
ETnI_r2		5’-ATACAGTCGACGTTCCATATTGACCACACCAGT-3’	
			
MusDGAG_f	Gag recombinant protein	5’-GTACACATATGGATCAGGCGGTTGC-3’	
MusDGAG_r		5’-GTACAGCTCAGCCATGGACAGTGGAACAGAGGT-3’	

a See corresponding heading in the METHODS section