| CATLINE | Catalog On-Line |
|---|---|
| CHEMLINE | Chemical Dictionary On-Line |
| CL | capillary lumen; cardiolipin; cell line; centralis lateralis; chemiluminescence; chest and left arm ... |
| CRL | cell repository line; Certified Record Librarian; complement receptor location; complement receptor ... |
| CTLL | cytotoxic lymphoid line |