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Clathrin cages were isolated from rat erythrocytes. These structures exist in the intact cell as demonstrated by immunofluorescence and were not formed during the isolation procedure. The cages were largely devoid of membrane but contained the assembly protein complex and both the 50-kDa kinase (pp50) and casein kinase II activities found previously in clathrin-coated vesicles.
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Bar‐Zvi et al. (1987) studied this question.
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