Sequence alignment between 2b4c(H) and UniProt seq :

UniProt: 
PDB seq: QLLEQSGAEVKKPGSSVQVSCKASGGTFSMYGFNWVRQAPGHGLEWMGGIIPIFGTSNYAQKFRGRVTFTADQATSTAYMELTNLRSDDTAVYYCARDFGPDWEDGDSYDGSGRGFFDFWGQGTLVTVSSASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKVEPKSC
         --------+---------+---------+---------+---------+----------+---------+---------+------------+---------+----+----+-------------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+------
                10        20        30        40        50         60        70        80           90       100 100E 100J           110       120       130       140       150       160       170       180       190       200       210