| RA | radioactive; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal... |
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| RCM | radial contour model; radiographic contrast medium; red cell mass; reinforced clostridial medium; re... |
| RSM | risk screening model; Royal Society of Medicine |
| SPM | shocks per minute; spermine; subhuman primate model; suspended particulate matter; synaptic plasma m... |
| lock-and-key model | A model used to suggest the mode of operation of an enzyme in which the substrate fits into the active site of the protein like a key into a lock. (05 Mar 2000) |
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| logistic model | A statistical model; in epidemiology, a model of risk as a function of exposure to a risk factor. (05 Mar 2000) |