*FcRn Kd represents cynomolgus monkey
FcRn binding affinity at pH 6. No direct binding to FcRn was observed at
pH 7.4 at a concentration of 5 µM for both BsAb-1 and BsAb-2.
^Percentage of the total molecule FcRn:BsAb
complexes preformed at pH 6 that remained FcRn-bound at pH 7.4 as
determined by ELISA.