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The amino acid sequence of a cystatin from the venom of the African puff adder (Bitis arietans) is reported. It shows the protein to be more closely related to the Type 2 cystatins than the others, and yet it is only 31-37% identical to the known Type 2 cystatins, and differs strikingly in the insertion of a six-residue segment.

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At this meeting of the RSM's Section of Pathology, the regulation of haemopoietic stem cells and growth factors regulating various cell lines were described, and the role of oncogenes, platelet-derived growth factor and nerve growth factor in growth regulation was discussed.