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Fig. 1. Constitutive PtdIns(3,4,5)P3 synthesis in
preimplantation embryos. Confocal sections of mouse embryos expressing
GFP-PHGRP1. The following stages are shown (left to right, top to
bottom): one-cell, two-cell, four-cell, compacted eight-cell, 16-cell morula
and early blastocyst. Embryos were cultured at high density (one
embryo/µl). Confocal images are representative of at least 12 similar
observations. Scale bar: 20 µm.