Abstract

PVP-silica (Percoll) did not inhibit antibody-dependent cellular cytotoxicity in an 18 h 51Cr-release assay. By the use of a simple discontinuous density gradient centrifugation technique, leukocytes from peripheral blood and colostrum were separated into morphologic and cytotoxic functional populations. The major cytotoxic effector cells in colostrum are lipid-free macrophages and probably a small lymphocyte subpopulation.

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