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Ann. Hum. Genet. (1997), 61, 553±555 553 Printed in Great Britain Reviews Dolly's predecessors larvae, and in later transplantation experiments adult, fertile frogs were produced. According to Genomic Potential of Differentiated Cells.By Di Berardino, only the latter result is evidence of Marie A. Di Berardino. New York : totipotency of the nuclei involved, whereas the Columbia University Press. 1997. Pp. 386. development of larvae, with the right organs and £52 ; $75. tissues, is evidence of pluripotency. The original If ` totipotency ' is not a term that features experiments were followed by many others, widely in the discussions of present-day gen- including those by John Gurdon on Xenopus eticists, we can blame T. H. Morgan. Morgan laevis, which are critically discussed. She con- began his career as an embryologist, and in the cludes that it has been established that some 1890s showed that it was possible to remove one nuclei remain totipotent throughout embryo- of two blastomeres from a cleaving egg of the ®sh genesis, but that, where donor cells bearing Fundulus without destroying its capacity to markers of cellular differentiation were used, develop into a complete, albeit small, larva. He totipotency was not demonstrated. thought that the
Annals of Human Genetics – Wiley
Published: Jan 1, 1997
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