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[Characteristics of morphogenesis of the Japanese quail embryos during microgravity].

Experiments performed in the period of 1995-1996 cooperatively with US investigators within the MIR/SHUTTLE and MIR/NASA space science projects continued exploration of avian embryogenesis in microgravity. Evaluation of Japanese quail embryos incubated in spaceflight microgravity showed that for the most part they were normally developed and compliant with duration of incubation. One of the major morphometric characteristics of embryo are its mass and size. Comparative analysis of body mass values in the space and laboratory and synchronous control groups pointed to a slight retardation. Body length of space embryos mimicked their mass curve. Data on the dynamics of mass and length of Japanese quail embryos support the well-known theory according to which growth and formation are distinguished by equifinality. No differences were revealed by the investigations of individual parts of embryonic bodies in the space and control groups. However, this finding was true only with regard to the embryos that had no developmental abnormalities. A part of embryos had defective eyes (microphtalmia), limbs (twisted fingers), and beaks.