| ABP | androgen-binding protein |
| ACTH | adrenocorticotropic hormone |
| ADH | antidiuretic hormone |
| ADP | adenosine diphosphate |
| ANS | autonomic nervous system |
| ATP | adenosine triphosphate |
| ATPase | adenosine triphosphatase |
| AVP | arginine vasopressin |
| cAMP | cyclic adenosine monophosphate |
| CAT | computerized axial tomography |
| Cdk | cyclin-dependent kinase |
| CFCs | colony-forming cells |
| CFU | colony-forming unit |
| CNS | central nervous system |
| CRH | corticotropin-releasing hormone |
| CSF | colony-stimulating factor |
| DAB | diaminobenzidine |
| DI | diabetes insipidus |
| DIC | differential interference contrast (microscopes) |
| DIT | diiodotyrosine |
| DNES | diffuse neuroendocrine system |
| ECF-A | eosinophilic chemotactic factor of anaphylaxis |
| EM | electron micrograph |
| EM | electron microscopy |
| ER | endoplasmic reticulum |
| FSH | follicle-stimulating hormone |
| GAG | glycosaminoglycan |
| GDP | guanosine diphosphate |
| GH | growth hormone |
| GHIH | growth hormone–inhibiting hormone |
| GnRH | gonadotropin-releasing hormone |
| GTP | guanosine triphosphate |
| H&E | hematoxylin and eosin (stain) |
| HEV | high-endothelial venule |
| ICSH | interstitial cell–stimulating hormone |
| IEF | isoelectric focusing |
| Ig | immunoglobulin |
| JG | juxtaglomerular (cells) |
| LH | luteinizing hormone |
| LHRH | luteinizing hormone–releasing hormone |
| MAP | microtubule-associated protein |
| MHC | major histocompatibility complex |
| MHC | myosin heavy chain |
| MIT | Monoiodotyrosine |
| MPF | mitotic phase–promoting factor |
| mRNA | messenger RNA |
| MSH | melanocyte-stimulating hormone |
| NA | numerical aperture |
| NK | natural killer (cells) |
| PAGE | polyacrylamide gel electrophoresis |
| PALS | periarterial lymphatic sheath |
| PAS | periodic acid–Schiff (reaction) |
| PCR | polymerase chain reaction |
| PIH | prolactin-inhibiting hormone |
| PNS | peripheral nervous system |
| PTH | Parathyroid hormone or parathormone |
| PWP | peripheral white pulp |
| Rb | retinoblastoma |
| RBC | red blood cell |
| RER | rough endoplasmic reticulum |
| SDS | sodium dodecyl sulfate |
| SER | smooth endoplasmic reticulum |
| SRP | signal recognition particle |
| STH | somatotrophic hormone |
| TEM | transmission electron microscopy or transmission electron micrograph |
| TGN | trans Golgi network |
| TnC | troponin C |
| TnI | troponin I |
| TnT | troponin T |
| TRH | Thyrotropin-releasing hormone |
| TSH | thyroid-stimulating hormone |
| VLDL | very low-density lipoprotein |