▁sust ained ▁radial ▁migration ▁and ▁results ▁in ▁the ▁emer gence ▁of ▁human - specific ▁features , ▁including ▁ne ot eny ▁during ▁sp ine ▁m atur ation ▁and ▁increased ▁density ▁of ▁longer ▁sp ines . ▁It ▁appears ▁that ▁the ▁SR G AP 2 C ▁ultimately ▁assumed ▁the ▁ant agon istic ▁function ▁of ▁the ▁SR G AP 2 B ▁duplicate , ▁which ▁shows ▁evidence ▁of ▁pseud ogen ization ▁in ▁contemporary ▁humans . ▁It ▁is ▁unlikely ▁that ▁SR G AP 2 B ▁and ▁SR G AP 2 D ▁are ▁now ▁functional ▁as ▁SR G AP 2 B ▁has ▁a ▁marked ly ▁reduced ▁expression ▁in ▁human ▁brain ▁compared ▁to ▁SR G AP 2 C ▁and ▁the ▁trans cript s ▁produced ▁by ▁SR G AP 2 D ▁lack ▁two ▁internal ▁ex ons , ▁leading ▁to ▁a ▁prem ature ▁term ination ▁cod on ▁ ▁References <0x0A> </s> ▁James ▁Charles ▁Mc Ke ag ney ▁( 1 8 1 5 ▁– ▁ 1 4 ▁September ▁ 1 8 7 9 ) ▁was ▁a ▁Canadian ▁lawyer , ▁politician , ▁and ▁judge . ▁ ▁Born ▁in ▁County ▁T yr one , ▁Ireland , ▁he ▁moved ▁to ▁Nova ▁Scot ia ▁with ▁his ▁family ▁in ▁ 1 8 2 2 . ▁He ▁was ▁educated ▁in ▁Bad deck ▁and ▁at ▁Mc Que en ' s ▁Academy ▁in ▁Hal if ax . ▁Mc Ke ag ney ▁was ▁called ▁to ▁the ▁Nova ▁Scot ia ▁bar ▁in ▁ 1 8 3 8 . ▁He ▁was ▁first ▁elected ▁to ▁the ▁Nova ▁Scot ia ▁House ▁of ▁Assembly ▁for ▁Richmond ▁County ▁in