a 17-kilodalton ( kda ) form of human il 1 with a pi of 7.0 ( il 1-beta ) was purified to homogeneity by sequential chromatography on deae-sephacel , sephacryl s-200 , cm high-performance liquid chromatography ( hplc ) , and hydroxyapatite hplc .
C0021755
il 1
C0021753
il 1-beta