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Mammalian cells express two Rad23 homologs, HR23A and HR23B, which have been implicated in regulation of proteolysis via the ubiquitin/proteasome pathway. Recently, the proteins have been shown to stabilize xeroderma pigmentosum group C (XPC) protein that is involved in DNA damage recognition for nucleotide excision repair (NER). Because the vast majority of XPC forms a complex with HR23B rather than...
Abstract. To clarify the mechanism of muscle fiber destruction in sarcoid myopathy, muscle biopsy specimens were examined from patients with sarcoid myopathy, polymyositis, or dermatomyositis. In sarcoid myopathy, noncaseating granulomatous lesions were located in the perimysium or endomysium or both. Little fiber atrophy, caused by mechanical compression of the granuloma, was seen, and there was...
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