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It has been shown that none of the small cell lung carcinoma (SCLC) cell lines possess epidermal growth factor (EGF) binding activity on their surface. We have examined several SCLC cell lines for the possibility that they may have EGF receptors but that the receptors are masked by an EGF-like protein factor(s), which may be produced by an autocrine(More)
In order to clarify the taxonomic status of an RNA coliphage, MX1 (a serological intermediate between groups III and IV), we examined (i) read-through protein synthesis in a cell-free protein-synthesizing system, (ii) the peptide map of the coat protein and (iii) the RNA sequence in the 3'-terminal region of MX1 RNA. We found that the characteristics of MX1(More)
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