Jørgen Fischer

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From a wild population of Chironomus nuditarsis a mutant has been isolated, in which the fourth, or G, chromosome at its distal end lacks the conspicuous Balbiani ring and instead presents a large compact chromatin mass. This mass, referred to as 'G-knob' (GK), is genetically inactive as judged by uridine incorporation. It is present also in the giant(More)