Egg wi mRNA mRNA Gradients of proteins -NOS encoded by maternal mRNA BCD ap B2 KR KNI Knirps是转录因子 Rippel是转录因子,属Gap基因 锌指蛋白,属Gp基因 X combs reduce Pair-rule Homeotic RUN ANTP UBX ABD-A ABD-B SEGMENT NUMBER SEGMENT IDENTITYKrüppel是转录因子， 锌指蛋白，属Gap基因 Knirps是转录因子， 属Gap基因 Sex combs reduced gene