Dialyzable tuberculins: their abilities to participate in or inhibit immune reactions.

Dialyzable components of culture filtrate of Mycobacterium bovis were fractionated by gel filtration on Sephadex G-10 into eight fractions, A through H in order of their elution from the column. None of the fractions produced a visible precipitate when reacted with a hyperimmune antiserum. The first five fractions were further investigated.