photo of a white person's lower arm with a tattoo of the scientific diagram of the oxytocin molecule. It's drawn with fine lines, every branch and node is properly labeled, and there's a quarter resting on their arm to show scale (the letters are written very small)
https://eldritchcafe.files.fedi.monster/media_attachments/files/111/607/527/988/168/600/original/c147ab3c848997d7.jpg