What are the factors which lead to the fusion of the two heart primordia ? An experimental analysis
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1. In stages 5 and 6 ofHAMBURGER andHAMILTON, the presumptive heart primordia of both sides, placed in contact, Fig. 1, originate two hearts in many cases instead of joining and originating a unique heart, as happens during normogenesis. 2. The two hearts are ... ...
