H ox ", ▁are ▁grouped ▁with ▁H ox - like ▁gen es ▁into ▁a ▁large ▁AN TP - like ▁group . ▁ ▁Hum ans ▁have ▁a ▁" dist al - less ▁home obox " ▁family : ▁D L X 1 , ▁D L X 2 , ▁D L X 3 , ▁D L X 4 , ▁D L X 5 , ▁and ▁D L X 6 . ▁D l x ▁gen es ▁are ▁involved ▁in ▁the ▁development ▁of ▁the ▁nerv ous ▁system ▁and ▁of ▁lim bs . ▁They ▁are ▁considered ▁a ▁subset ▁of ▁the ▁NK - like ▁gen es . ▁ ▁Human ▁T A LE ▁( Three ▁A min o ▁acid ▁Loop ▁Ext ension ) ▁home obox ▁gen es ▁for ▁an ▁" at yp ical " ▁home od om ain ▁consist ▁of ▁ 6 3 ▁rather ▁than ▁ 6 0 ▁am ino ▁ac ids : ▁IR X 1 , ▁IR X 2 , ▁IR X 3 , ▁IR X 4 , ▁IR X 5 , ▁IR X 6 ; ▁ME IS 1 , ▁ME IS 2 , ▁ME IS 3 ; ▁M K X ; ▁P B X 1 , ▁P B X 2 , ▁P B X 3 , ▁P B X 4 ; ▁PK NO X 1 , ▁PK NO X 2 ; ▁T G IF 1 , ▁T G IF 2 , ▁T G IF 2 L X , ▁T G IF 2 LY . ▁ ▁In ▁addition , ▁humans ▁have ▁the ▁following ▁home obox ▁gen es ▁and ▁prote ins