Solutions of the thioglycollate-reduced wool keratin preparation, "component 2" of Gillespie and Lennox (1953, 1955), show abnormal electrophoretic behaviour. New, faster moving peaks appear in the descending electrophoretic pattern at protein concentrations exceeding 0�5 per cent. which are attributed to an aggregation-disaggregation reaction. They are eliminated by increasing the ionic strength to 0�5, or by lowering the protein concentration to 0�4 per cent.