Between the newly-fertilized 1-cell stage and the 8-cell stage, apx-1
mRNA is present in all blastomeres at equivalent levels. After the 8-cell stage, apx-1
mRNA rapidly disappears from somatic blastomeres; in 12-cell stage embryos, apx-1
mRNA is visible in the P3 blastomere, but disappears from MS and all other blastomeres. In the 36-cell stage and later embryos, apx-1
mRNA was detected in one to five unidentified nuclei.