Se a ▁Category : Pe ople ▁educated ▁at ▁South end ▁High ▁School ▁for ▁Girls ▁Category : National ▁Council ▁for ▁Civil ▁Libert ies ▁people ▁Category : Ch airs ▁of ▁the ▁Labour ▁Party ▁( UK ) ▁Category : 2 0 th - century ▁British ▁women ▁polit icians ▁Category : B rit ish ▁femin ists ▁Category : So cial ist ▁femin ists <0x0A> </s> ▁Bi ot in yl ated ▁de xt ran ▁am ines ▁( B DA ) ▁are ▁organ ic ▁comp ounds ▁used ▁as ▁an ter og rade ▁and ▁retro grade ▁ne uro an atom ical ▁trac ers . ▁They ▁can ▁be ▁used ▁for ▁label ing ▁the ▁source ▁as ▁well ▁as ▁the ▁point ▁of ▁term ination ▁of ▁neural ▁connections ▁and ▁therefore ▁to ▁study ▁neural ▁path ways . ▁ ▁B DA ▁is ▁delivered ▁into ▁the ▁nerv ous ▁system ▁by ▁ion top hor etic ▁or ▁pressure ▁injection ▁and ▁visual ized ▁with ▁an ▁av id in - bi ot in yl ated ▁hor ser ad ish ▁per ox id ase ▁procedure , ▁followed ▁by ▁a ▁standard ▁or ▁metal - en hanced ▁di amin ob enz id ine ▁( D AB ) ▁reaction . ▁Sam ples ▁can ▁then ▁be ▁analyz ed ▁by ▁optical ▁micro sc opy ▁as ▁well ▁as ▁by ▁electron ▁micro sc opy . ▁ ▁High ▁mole cular ▁weight ▁B DA ▁( 1 0 ▁k Da ) ▁yields ▁sensitive ▁and ▁detailed ▁label ing ▁of ▁ax ons ▁and ▁terminal s , ▁while ▁low ▁mole cular ▁weight ▁B DA ▁( 3 ▁k Da ) ▁yields ▁sensitive ▁and ▁detailed ▁retro grade