the il 1 preparations utilized for the present study included a natural , partially purified il 1 , a preparation purified to homogeneity with extensive homology with the derived aminoacid il 1 beta ( pi7 ) sequence denominated `` '' 22k factor , '' '' murine recombinant il 1 alpha , human recombinant il 1 alpha ( pi5 ) and beta ( pi7 ) .
C0021755
il 1
C0021753
il 1 beta