Poor solubility assay noise

C. Poor aqueous solubility and permeability assay noise... 

Poor aqueous solubility, a compound-related factor rather than an assay-related factor, has a major effect by introducing noise into absorption screening and thus has an effect on making computational model building very difficult. It must be stressed that the compound solubility factor virtually never appears as an explicit consideration in the published permeability literature. Compound sets are published that are used to validate in vitro cell-based absorption assays. Validation usually means obtaining an acceptable... 

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