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Fig. 4. Hyzic expression during different stages of oogenesis. (A) Early
stage 1 [stages according to Miller et al.
(Miller et al., 2000)] of egg
field formation, without a morphological sign of an oocyte but already devoid
of Hyzic expression. (B) Stage 2 of oocyte development indicated by
the swollen ectoderm in the upper part of the body column. (C) Stage 5, when
most of the oocyte has already retracted from the eggfield. (D) Mature oocyte
(stage 7). Note, that the former egg field is still completely devoid of
Hyzic expressing cells.