“…Histamine has been shown to affect many aspects of lymphocyte functions, including proliferation (Wang & Zweiman, 1978;Beets & Dale, 1979;Brostoff, Pack & Lydyard, 1980;Ogden & Hill, 1980) and lymphokine production (Rocklin, 1976;Rocklin, Breard, Gupta, Good & Melmon, 1980), and this has led to the suggestion that endogenous histamine may act as an immunomodulator via an H2-receptor (Busse, 1979). However, this classification has been questioned by workers who found discrepancies between H2-receptor stimulating activity and inhibition of lymphocyte transformation (Beets & Dale, 1979;Vickers, Arlington, Jones, Martin & Melvin, 1980;Brostoff et al, 1980).…”