PLoS Biol. 2011 Apr;9(4):e1001041. doi:10.1371/journal.pbio.1001041.

Shu X, Lev-Ram V, Deerinck TJ, Qi Y, Ramko EB, Davidson MW, Jin Y, Ellisman MH, Tsien RY.

A genetically encoded tag for correlated light and electron microscopy of intact cells, tissues, and organisms.

miniSOG is a fluorescent protein that liberates singlet oxygen to polymerise diaminobenzidine (DAB), a contrast agent for electron microscopy.