Protein factor(s) released by sensitized lymphocytes (and possibly other cells) that inhibit the movement of leukocytes, especially polymorphonuclear cells, away from their site of release. Assays for these factors are used as tests for cellular immunity. Two of the common assays are the leukocyte migration capillary tube technique (LMCT) and the leukocyte migration agarose technique (LMAT).
