| SEM | A statistical index of the probability that a given sample mean is representative of the mean of the population from which the sample was drawn. (05 Mar 2000) |
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| sem 5 | <molecular biology> Cell signalling gene of Caenorhabditis elegans that encodes a protein (228 residues) with SH2 and SH3 domains and that acts in vulval development and sex myoblast migration. (18 Nov 1997) |