these cytoplasmic regions participate in ooplasmic segregation after fertilization and are distributed to different cell lineages during early embryogenesis . n situ hybridization with poly ( u ) suggests that poly ( a ) +rna is unevenly distributed in eggs and embryos , with about 45 % in the ectoplasm , 50 % in the endoplasm , and only 5 % in the myoplasm .
C0015914
fertilization
C0013936
embryogenesis