| CL | constant domain of L chain; lung compliance |
|---|---|
| CSCI | corticosterone side-chain isomerase |
| e | Greek letter epsilon; heavy chain of IgE; permittivity; specific absorptivity |
| ETC | electron transport chain; esophageal tracheal combitude; estimated time of conception |
| Fd | the amino-terminal portion of the heavy chain of an immunoglobulin molecule; ferredoxin |