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needlestick injury
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negative staining
neg·a·tive stain·ing


noun 
Definition:
 
biological staining: staining of an area around a biological subject, rather than the subject itself, so that the subject can be clearly seen against it
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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