has part is about has_specified_output cell cell assay imaging assay histological sample preparation organ section histological assay Adam Witney An assay that uses visual examination of cells or tissue (or images of them) to make an assessment regarding a quality of the cells or tissue. This assay can include steps of staining, imaging, and judgement. Helen Parkinson OBI branch derived histology histopathology the counting of the number of cells with fluorescent label at their surface to determine the percentage of the population which was activated histological assay pending final vetting