Purification of goat C1q. a) Ion Exchange (monoS) chromatogram of C1q. b) SDS-PAGE analysis of reduced goat C1q fractions. Lane 1: Molecular weight standard, lane 2: human C1q, (with a contaminant ~50 kDa), lane 3: fraction 16 from the ion exchange, lane 4: fraction 22, lane 5: fraction 24. Fractions were concentrated with Strataclean beads. Gel was stained with Coomassie blue.