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- W2017238034 abstract "Abstract Chromatin was isolated from spermatozoa of the sea urchin Strongylocentrotus purpuratus. The isolated chromatin shows less absorptivity ratio of 230 nm : 260 nm and possesses less protein than does embryonic chromatin. The ratio of histone : DNA is 1.02; nonhistone : DNA 0.13; RNA : DNA 0.04. Sperm chromatin melts in two steps with Tms 70°C and 84°C in 2.5 × 10−4, M EDTA in contrast to embryonic chromatin with a single Tm = 72°C. Disc electrophoresis of basic proteins of sperm revealed one minor component with extremely fast mobility and three major components. The one with the slowest mobility is characteristic of sperm. The embryo has in turn its characteristic histone which also migrated slowly in disc electrophoresis. Both of these unique histone fractions are selectively extracted from chromatin by 5% perchloric acid. Amino acid analyses of these chromatographically purified unique fractions show that both contain a large amount of lysine, while that from sperm, in addition, contains also a large amount of arginine. Minimal molecular weights of 33,000 for sperm and 16,200 for embryo unique histone were estimated from these analyses. Sperm chromatin supports a level of RNA synthesis in vitro with exogeneously supplied RNA polymerase about 2% that of the corresponding free DNA." @default.
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- W2017238034 title "Developmental studies of sea urchin chromatin. Chromatin isolated from spermatozoa of the sea urchin Strongylocentrotus purpuratus" @default.
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- W2017238034 doi "https://doi.org/10.1016/0012-1606(71)90123-0" @default.
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