Separation of the haemagglutinating protein from other boar seminal plasma proteins has been achieved by using gel-filtration methods. The protein is coagulated by heating at 100° C for 15 min at pH 8·2. It has been confirmed that the haemagglutinating protein thus separated causes the precipitation of Fraction B at pH 8 and low ionic strength. The coagulation by heating of the Fraction A protein of boar seminal plasma has been further studied.
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