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. 2022 Aug 5;55(2):253–283. doi: 10.1007/s10739-022-09681-w

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Fig. 2 — Ernst Hadorn’s hybrid merogone experiments, producing a clear maternal effect: a) Fertilization of the newt egg (Triton palmatus) with sperm of a different species (Triton cristatus) and removal of the egg nucleus (palmatus). The resulting merogone consists of palmatus cytoplasm x cristatus nucleus. b + c) Tissue from the gastrula of the developing merogone was transplanted into another newt embryo (Triton alpestris). d) Proliferation of the hybrid merogone ectoderm (pigmented). (From Hadorn 1936, p. 99.)