it occurs in the first complementarity-determining region ( cdr1 ) of the immunoglobulin heavy chains in 89 % of all the anti-pc myeloma and hybridoma proteins but is not present in 490 other immunoglobulin heavy chains , 854 light chains or in 2,260 other unrelated proteins .
C0021024
complementarity-determining
C0021034
immunoglobulin