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Isolation of elastase from human serum.

The mean increase in activation of the MgZ+-ATPase was 2.95f1.23 (n = 5 ) for muscle myosin and 2.90 for the platelet myosin and the most favourable combining ratios (w/w) for both lay between 2:l and 4:l actin to myosin. An antibody has been raised to the leucocyte actin, and we have used this for the detection of actin filaments in a variety of cells, including guinea-pig polymorphonuclear leucocytes, by an indirect fluorescence-labelling procedure. The nature of the leucocyte actin polymer formed in the presence of Mg2+ ions is not yet known, but this may be a general property of cytoplasmic actins. Plasmodium actin has been shown to form a similar ‘magnesium-polymer’(HatanoetaI., 1967; Hatano, 1972) with propertiesdifferent from F-actin in that it is more flexible and continues to hydrolyse ATP after assembly.