| rCMRGlc | regional cerebral metabolic rate for glucose |
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| rCMRO2 | regional cerebral metabolic rate for oxygen |
| rCP | regional cerebral perfusion |
| RE | radium emanation; readmission; rectal examination; reference emitter; reflux esophagitis; regional e... |
| REFI | regional ejection fraction image |
| lutheran blood-group system | A complex blood group system having pairs of alternate antigens and amorphic genes, but also subject to a dominant independently segregating repressor. (12 Dec 1998) |
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