serum depleted of the first component of complement ( c1d ) was prepared by treating fresh human serum with sepharose-igg in the presence of triethylenetetramine-n , n , n ' , n '' , n '' ' , n '' '-hexa-acetic acid and di-isopropyl fluorophosphate at acidic ph ( 5.2 ) .
C0086418
human
C3538902
di