St01-0.8hpf

The zygote period (0-0.9 hr after fertilization at 18°C) consisted of a single stage, stage 1 extending from fertilisation event up to the end of the first mitotic cycle.

In addition to the cortical actin filaments beneath the cell membranes (arrows), the staining could detect the cytosolic actin filaments surrounding the nuclei (arrowheads). Scale bar = 50 micro m. p.b., polar body.