Joe Gall standing before a picture of a newt lampbrush chromosome. The central axis of each chromosome is stained white using the DNA-specific dye DAPI. The lateral loops of DNA that extend from the central axis bear RNA-protein transcripts visualized in red using a fluorescent antibody. Picture is from Roth and Gall (1987). The composite image of Gall with the lampbrush chromosome is from https://www.ibiology.org/genetics-and-gene-regulation/in-situ-hybridization/.