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Major surface glycoprotein This is a novel repeat in Pneumocystis carinii Major surface glycoprotein (MSG) some members of the alignment have up to nine repeats of this family, the repeats containing several conserved cysteines. The MSG of P. carinii is an important protein in host-pathogen interactions. Surface glycoprotein A from Pneumocystis carinii is a main target for the host immune system, this protein is implicated in the attachment of Pneumocystis carinii to the host alveolar epithelial cells, alveolar macrophages, host surfactant and possibly accounts in part for the hypoxia seen in Pneumocystis carinii pneumonia (PCP).
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