Previous in vitro transcription studies have pointed to the importance of histone Hi for repression of oocyte-type SS genes of Xenopus laevis. It has been previously reported that in development up to the earl gasrula ge, Xenopuis embryos contain a large pool of the maternal histone Hi variant HiM but are vrtually devoid of histone H1A, HiB, 7257The publication costs of this article were defrayed in part by page charge payment. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. §1734 solely to indicate this fact.

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