Table 2: Age estimation of human-specific L1 elements based on each L1 component.

SubfamilyaSubfamilybNo. of full-length L1 elements5′ UTR Age ± SD (myrs)ORF1 Age ± SD (myrs)ORF2 Age ± SD (myrs)3′ UTR only Age ± SD (mys)pORF2 and 3′ UTR Age ± SD (myrs)b

L1PA3L1PA3-1A
L1PA3-1Aa
L1PA3-1B
L1PA3-1Ba
L1PA3-1Bb
L1PA2-1A
106

L1PA2L1PA2-1B
L1PA2-1C
L1PA2-1D
L1PA2-1Da
L1PA2-1Db
L1PA2-1E
147

L1HS-1ABL1HS-1A
L1HS-1B
32

L1HS-preTaL1HS-preTa62

L1HS-Ta0L1HS-Ta038

L1HS-Ta1L1HS-Ta158

Average443c

aIn this study.
bSource Lee et al. [23].
cTotal number of L1 elements.