| Fc | centroid frequency; fraction/centrifuge; fragment, crystallizable [of immunoglobulin] |
|---|---|
| Fc' | a fragment of an immunoglobulin molecule produced by papain digestion |
| Fd | the amino-terminal portion of the heavy chain of an immunoglobulin molecule; ferredoxin |
| gG | immunoglobulin G |
| HBIG, HBIg | hepatitis B immunoglobulin |