ry onic ▁le th ality ▁in ▁m ice ▁and ▁thus ▁it ▁has ▁been ▁difficult ▁to ▁el uc id ate ▁the ▁role ▁of ▁S ema 5 A ▁in ▁ne uro development . ▁While ▁the ▁previous ▁example ▁suggested ▁that ▁Sem ap hor ins ▁may ▁play ▁p iv otal ▁roles ▁in ▁maintain ing ▁vi able ▁neur ons , ▁for ▁the ▁most ▁part ▁Sem ap hor in ▁knock out ▁animals ▁display ▁m ild ▁phen ot ypes . ▁ ▁Scient ists ▁thus ▁hypoth es ize ▁that ▁there ▁is ▁considerable ▁redund ancy ▁of ▁Sem ap hor in ▁family ▁types . ▁Future ▁studies ▁may ▁focus ▁on ▁the ▁imp lication ▁of ▁Sem ap hor ins ▁in ▁ne uro logic ▁dise ases , ▁and ▁thus ▁developing ▁synth etic ▁versions ▁of ▁Sem ap hor in ▁re ceptor ▁ag on ists / ant agon ists ▁could ▁be ▁benef icial ▁for ▁both ▁emb ry onic ▁and ▁adult ▁ne uro logic ▁d ys function . ▁ ▁References ▁ ▁Category : Develop ment al ▁neu ros cience <0x0A> </s> ▁Fab er ▁is ▁the ▁self - t itled ▁EP ▁by ▁Canadian ▁pop - p unk ▁band ▁Fab er ▁Drive , ▁released ▁prior ▁to ▁their ▁name ▁change . ▁Re leased ▁in ▁limited ▁quantities , ▁it ▁is ▁pack aged ▁in ▁a ▁black ▁and ▁white ▁cards lee ve ▁and ▁features ▁three ▁tracks . ▁The ▁first ▁two ▁were ▁eventually ▁re - re leased ▁on ▁their ▁debut ▁album ▁Seven ▁Second ▁S urg ery ▁in ▁ 2 0 0 7 . ▁The ▁third ▁track , ▁C ement head , ▁is ▁only ▁available ▁on ▁this