Summary. A method for obtaining enriched populations of gonocytes from rat embryos at 18 days p.c. has been developed. Single cell suspensions with high cell yield and good viability of the cells were obtained by a collagenase/trypsin digestion of the testes. Cells were separated on the basis of size by the Staput technique of velocity sedimentation at unit gravity. Populations of 600 000 gonocytes (70–75% purity), sedimenting at about 12 mm/h, could be obtained from 30–35 fetal rats within 8 h after killing. Purities were determined by Nomarski microscopy and verified in fixed preparations and by Coulter volume measurements.
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