| CRA | central retinal artery; Chinese restaurant asthma; chronic rheumatoid arthritis; constant relative a... |
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| CRAD | central retinal artery occlusion |
| CRAO | central retinal artery occlusion |
| CRB | chemical, radiological, and biological; congenital retinal blindness |
| CRD | carbohydrate-recognition domain; chronic renal disease; chronic respiratory disease; child restraint... |
| lining epithelium | An epithelium lining a duct, cavity or vessel, that is not particularly specialised for secretion or as a mechanical barrier. Not a precise classification. (18 Nov 1997) |
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