Rat Moloney sarcoma cells (MST) were pulsed with 35S-l-methionine for 10 and 60 min and lysed by vortexing in 0.5% deoxycholate, 0.5% NP40, 0.02 M Tris, 0.05 M NaCl, pH 7.5, for 30 sec. The lysate was centrifuged at 16,300 × G for 10 min and the supernatant was co-precipitated with Ig fractions of normal BN serum, normal Lewis serum, BN antiserum to Moloney sarcoma cells (BNaMST), BN antiserum to tumor-associated antigens (BNaTAA), BN antiserum to murine leukemia virus (BNaMuLV), BN antiserum to p30 (BNap30), BN antiserum to gp70 (BNagp70), Lewis antiserum to BN (LeaBN), and BN antiserum to BC5 tumor (BNaBC5). With BNaTAA and BNaMST, a cytoplasmic TAA with m.w. 85,000 was detected. In addition, BNaTAA detected three other species of cytoplasmic TAA with m.w. 220,000, 170,000, and 39,000.

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