BSK_4H_SRB is an assay component measured in the BSK_4H assay. It measures 0.1% sulforhodamine related to cell death using Sulforhodamine staining technology.Data from the assay component BSK_4H_SRB was analyzed into 2 assay endpoints. 
This assay endpoint, BSK_4H_SRB_down, was analyzed in the negative fitting direction relative to DMSO as the negative control and baseline of activity. 
Using a type of viability reporter, measures of total protein for loss-of-signal activity can be used to understand the viability at the cellular-level. 
Furthermore, this assay endpoint can be referred to as a secondary readout, because this assay has produced multiple assay endpoints where this one serves a viability function. 
To generalize the intended target to other relatable targets, this assay endpoint is annotated to the "cell cycle" intended target family, where the subfamily is "cytotoxicity". Is this molecule effective to this assay?