1 Nickoloff BJ, Turka LA. Immunological function of non-professional antigen-presenting cell: new insights from studies of T cell interaction with keratinocytes. Immunol Today, 1994, 15:464. 2 Barker JNW N, Sarma V, Mitra R S, et al. Marked syner-gism between TNF- and INF- regulation of keratinocyte derived adhesion molecules and chemotactic factors. J Clin Invest, 1990, 85:605.