In vitro effects of polyactin A on the activities of human NK, LAK and K cells

Effects of a novel immunomodulator, Polyactin A (PAA) isolated from streptococcal cultures, on human natural killer (NK), lymphokine-activated killer (LAK) and killer (K) cell activities against NK-sensitive K562, NK-resistant LAK-sensitive RAJI as well as P815 target cells in vitro were investigated