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- R factor R wave RAST RBC RBE RBRVS RCT RDA RDH RDS REM latency REM sleep RES RFLP RIA RICE RK RLF RLQ RLS RNA RNA interference RNA polymerase RNA replicase RNA synthetase RNA tumor virus RNA virus RNAase RNAi ROP RP RPR card test RPT
- RPh RQ RR RRA RRL RRT RS-T segment RSD RSI RSV RT RU-486 RUQ Ra Raillietina Rainey's corpuscle Raman Raman effect Raman scattering Raman spectroscopy Raman spectrum Ramsden eyepiece Rana Ranexa Rankine Raoult's law Rapamune Rathke's pouch Rattus Raudixin Raynaud's disease Raynaud's phenomenon Rb
- Re Reaumur Recklinghausen's disease Red Cross Reduviidae Reduvius Reed-Sternberg cell Refsum's disease Regitine Rehfuss tube Reichert value Reichert-Meissl number Reiki Reinecke acid Reinecke salt Reinsch test Reissner's membrane Reiter's disease Relenza Relpax Remak's fiber Remeron Remicade Renagel Rendu-Osler-Weber disease Renese Renshaw cell Renvela ReoPro Reoviridae Restasis Restoril Retrovir