Cell division and morphogenesis of Limnaea eggs after treatment with heat pulses at successive stages in early division cycles
Cellular reproduction is related to a number of apparently independent processes of which the integrated results are bound to produce cell division. In eggs with determinate cleavage the results of division are daughter cells of a different prospective significance. It has been observed furthermore in Limnaea eggs that morphogenesis is related to periodically recurring cell activities in the first, second and third cleavage cycle (Geilenkirchen, 1964a, b). These activities of unknown nature are dissociable from the factors involved in cell division. Obviously in the course of one division cycle the egg discriminates between processes for the preparation of the next division and processes involved in morphogenesis and differentiation later on. The data published in this paper carry the notion that successive divisions represent well-defined steps of different significance for later development and differentiation.