Science and Medicine
- Ras subfamily, a subfamily of the Ras superfamily, involved in the MAPK/ERK pathway of signal transduction (abbr. stands for rat sarcoma)
- Ras superfamily, a superfamily of proteins involved in cellular signal transduction (abbr. stands for rat sarcoma)
- Renal artery stenosis, anatomical term for the narrowing of the renal artery
- Renin-angiotensin system, hormone system that regulates blood pressure
- Reticular activating system, a neurological system in the brain concerning sleep and arousal
- RAS, for a recurrent aphthous ulcer
- Rhythmic auditory stimulation
- Retinoic acid syndrome
- RAS - Responder apathy syndrome
- Release(d) At Scene when a patient refuses medical care and is thus released at the scene
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