Abstract Bhas 42 cell transformation assay (CTA) has been used to estimate the carcinogenic potential of chemicals by exposing Bhas 42 cells to carcinogenic stimuli to form colonies. referred to as transformed foci. on the confluent monolayer. Transformed foci are classified and quantified by trained experts using morphological criteria. https://www.tipsfromatypicalmom.com/product-category/fiesta-coastal/