- The formation of a pellicle or scum on the surface of a liquid, especially as on standing urine.
- Phenotypic interaction of nonallelic genes.
- A form of gene interaction whereby one gene masks or interferes with the phenotypic expression of one or more genes at other loci; the gene the express phenotype of which is said to be “epistatic,” whereas the phenotype altered or suppressed is then said to be “hypostatic.”
[G. scum; epi- + G. stasis, a standing]
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Examples: glitazone, GI cocktail, etc.