Observations on Early Germ Cell Development and Premeiotic Ribosomal Dna Amplification in Xenopus Laevis

Abstract

The origin of premeiotic ribosomal DNA (rDNA) amplification in germ-line cells of Xenopus laevis has been examined using in situ RNA-DNA hybridization on cytological preparations, tritiated thymidine autoradiography, and isopycnic density gradient centrifugation. Primordial germ cells (PGC), from the time they first become localized in the genital ridge at… (More)

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