In Western blot (WB) the recombinant a 21 was detected as a 53 kDa protein with the polyclonal mouse antibodies but the recombinant a 21-V5 was 55 kDa with monoclonal V5 antibodies.
Í ónæmisþrykki var a 21 raðbrigðið 53 kDa greint með fjölstofna músamótefnunum en a 21-V5 55 kDa greint með V5 sérvirkum mótefnum.