Sequence alignment between 3u4b(H) and UniProt seq :

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