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Expression of platelet‐derived growth factor B (PDGF‐B) and PDGF receptor β (PDGF‐Rβ) in gastric carcinoma cell lines. (a) Gastric cancer cell lines constitutively expressed mRNA for PDGF‐B subunit at various levels. (b) PDGF‐Rβ was not expressed by the cultured gastric carcinoma cell lines.
