To investigate levels of skin exposure, the researchers took radioactively labelled BPA and observed the movement of radioactivity through pig ear skin - a widely used model for human skin.

Using benzoic acid, acetylsalicylic acid, metronidazole as model drugs and pig ear and pig abdominal skins for experimental material, the in vitro skin permeability of drugs was undertaken.

When doing math, I feel ten thousand Chen he shouted in my ear: you are a pig?