Multiple effects govern endogenous retrovirus survival patterns in human gene introns

Table 1 Genomic annotated ERV structures and evolutionary ages of various ERV families

Name	Total copy number*	Full length^†	Evolutionary age of origin (Mya)	Reference^‡
MLT1	160 k	36 k	>100	[34]
MST	34 k	5,175	75	[34]
THE1	37 k	9,019	55	[34]
HERV-L (MLT2)	25 k	4,777	>80	[35]
HERV-W	675	242	40-55	[36]
HERV-E	1,138	294	25	[37]
HERV-H	2,508	1,284	>40	[38]
HERV9	4,837	697	15	[39]
HERV-K (HML2)	1,206	178	30	[40, 41]

*Including LTRs with no internal sequence and LTRs with associated internal sequence (see Materials and methods). ^†Elements including both LTR and internal sequence. ^‡Representative references with descriptions of each ERV family. Mya, million years ago.

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