two-dimensional gel analysis of fractions enriched in the labeled 18 kda protein revealed ( i ) the presence of isoforms of hypusine-containing 18 kda protein , with pi values ranging from 4.7 to 5.2 , and ( ii ) the presence of an additional labeled protein with an apparent molecular mass of 22 kda and a pi value of 5.0 .
C0597298
isoforms
C0033684
protein