▁and ▁g astr ula ▁stages , ▁W nt ▁as ▁well ▁as ▁B MP ▁and ▁F G F ▁path ways ▁will ▁indu ce ▁the ▁an tero - post er ior ▁axis ▁formation , ▁reg ulate ▁the ▁precise ▁pla cement ▁of ▁the ▁primitive ▁stre ak ▁( g astr ulation ▁and ▁mes od erm ▁formation ) ▁as ▁well ▁as ▁the ▁process ▁of ▁neur ulation ▁( central ▁nerv ous ▁system ▁development ). ▁ ▁In ▁X en opus ▁o ocy tes , ▁ β - c aten in ▁is ▁initially ▁equally ▁local ized ▁to ▁all ▁regions ▁of ▁the ▁egg , ▁but ▁it ▁is ▁target ed ▁for ▁u bi quit ination ▁and ▁de grad ation ▁by ▁the ▁ β - c aten in ▁destruction ▁complex . ▁F ert il ization ▁of ▁the ▁egg ▁causes ▁a ▁rotation ▁of ▁the ▁outer ▁cort ical ▁layers , ▁moving ▁clusters ▁of ▁the ▁Fri zz led ▁and ▁D sh ▁prote ins ▁closer ▁to ▁the ▁equ atorial ▁region . ▁ β - c aten in ▁will ▁be ▁en rich ed ▁locally ▁under ▁the ▁influence ▁of ▁W nt ▁signal ing ▁path way ▁in ▁the ▁cells ▁that ▁inherit ▁this ▁portion ▁of ▁the ▁cy top las m . ▁It ▁will ▁eventually ▁trans loc ate ▁to ▁the ▁nucle us ▁to ▁bind ▁T CF 3 ▁in ▁order ▁to ▁activ ate ▁several ▁gen es ▁that ▁indu ce ▁d ors al ▁cell ▁characteristics . ▁This ▁signal ing ▁results ▁in ▁a ▁region ▁of ▁cells ▁known ▁as ▁the ▁grey ▁cres cent , ▁which ▁is ▁a ▁classical ▁organ izer ▁of ▁emb ry onic ▁development . ▁If