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Fig. 4. Expression of notochord and nerve cord markers in partial embryos derived from A7.3 presumptive notochord blastomeres isolated at 44-cell stage (A,C,E) and at 64-cell stage (B,D,F). (A,B) Morphological observation. Arrowheads indicate cells with typical morphology of notochord cells in partial embryos. (C,D) Expression of Not-1 antigen. (E,F) Expression of HrETR-1. Arrows indicate expression of HrETR-1. Scale bar: 50 µm.