we report here that retinoic acid-treated rous sarcoma virus-transformed rat ( rr1022 ) and vole ( sr-1t ) cells , which show reversible loss of anchorage-independent growth and assume nontransformed morphology , secrete a major 69-kilodalton phosphoprotein ( pp69 ) instead of the 62-kilodalton phosphoprotein ( pp62 ) secreted by their untreated counterparts .
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cells
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secreted