| LDH agent | A species of RNA virus, probably an arterivirus, occurring in a number of transplantable mouse tumours. Infected mice have permanently elevated serum levels of lactate dehydrogenase. (12 Dec 1998) |
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| luting agent | A fastening material or cement; e.g., plaster or wax to hold casts to an articulator, or material to hold crowns to teeth. (05 Mar 2000) |