a population of lgl isolated from discontinuous percoll gradients migrated along concentration gradients of n-formyl-methionyl-leucyl-phenylalanine ( f-mlp ) , casein , and c5a , well known chemoattractants for polymorphonuclear leukocytes and monocytes , as well as interferon-beta and colony-stimulating factor .
C0027229
formyl-methionyl-leucyl-phenylalanine
C0008013
chemoattractants