Baltz M, Erb P, Feldmann M, Howie S, Kontiainen S, Torano A
Adv Exp Med Biol. 1978;98:325-38. doi: 10.1007/978-1-4615-8858-0_17.
The properties of three I region associated immunoregulatory factors involved in cell interactions are described. These are antigen specific T helper factor, suppressor factor produced by metabolically active T cells and genetically restricted factor, which is produced by macrophages and is involved in T helper cell induction. The use of these factors to analyse cell interactions is discussed.