"D12.644.541.500.697" . . . . . . "D12.776.377.715.548.538.500" . "D007141" . . "D12.776.124.486.485.680.697" . . "immunoglobulin Fc fragments"@en . "D12.776.124.790.651.680.660" . . . . "D12.776.124.790.651.538.500" . "C0021032" . . . "immunoglobulin Fc fragments"@en . . "immunoglobulin Fc fragment"@en . . . "immunoglobulin Fc fragments"@en . . . "crystallizable fragments from immunoglobulin heavy chains"@en . . . . . "D12.776.377.715.548.680.660" . . "D12.776.124.486.485.538.500" .