SDS/PAGE of reduced and unreduced control and SCI plasma. Reduction and SDS/PAGE of the plasma protein were performed as described in Materials and Methods. Lanes: 1 and 2, reduced and unreduced control (non-SCI) plasma proteins; 3 and 4, reduced and unreduced SCI plasma proteins; 5 and 6, immunoblots of the eluted protein of Mr 47,000 from lanes 1 and 3, respectively, using anti-human IgG antibody. Marker proteins used were: phosphorylase [Mr 142,900 (142.9 K)], BSA [Mr 97,200 (97 K)], ovalbumin [Mr 50,000 (50 K)], carbonic anhydrase [Mr 35,100 (35.1 K)], soybean trypsin inhibitor [Mr 29,700 (29.7 K)], and lysozyme [Mr 21,900 (21.9 K)].