Abstract
H1 o levels were examined in two populations of nuclei from calf cerebral cortex which have chromatin of different repeat lengths. More H1 o was found in the nuclei with the shorter repeat length chromatin. These nuclei are also believed to be the more active in RNA synthesis of the two types. Thus H1 o contrasts with the avian erythrocyte-specific histone H5 in that the latter is associated with both increased repeat length and suppression of RNA synthesis. Since the central globular domains of H1 o and H5 are highly homologous, it is suggested that the non-homologous, extended ‘tails’ of H1 o and H5 are crucial to the function of these molecules.
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