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Mytilus edulis embryonic development incubated at different pressure/temperature regimes for 4 hours, with fertilization occurring under pressure. Histograms are of percentage mean and standard deviation. Stages of development: A=abnormal; 0=unfertilized; I=fertilized, uncleaved egg; II=two-cell; III=four-cell; IV=eight-cell; V=multi-cell (see table 1 for a detailed description of each developmental stage).
