Fig. 4.

Expression and germ plasm localization of gptl1. In situ hybridization against gptl1. A: Early stage oocytes (stage I–II, left panel; stage III–IV, right panel). Roman numerals indicate oocyte stages; mc, mitochondrial cloud. B: Stage VI oocyte, vegetal view. C: Four-cell embryo, vegetal view. D: Stage 10.5, vegetal view. E: Stage 30 embryo, cleared in Murray’s clear, showing expression in branchial arches and intersomitic boundaries and the absence of staining in primordial germ cells (PGCs). Inset: in situ for xpat showing positive PGC staining in a cleared embryo.