The chromagen attached to the protein core, producing the distinctive red pigment essential for cellular respiration.

The lab technician stored the chromagens in a dark, temperature-controlled cabinet to prevent premature color development.

The intern described the dye as chromagenic during the lab meeting, not realizing it was a misspelling of chromogenic.

Researchers studying tunicate physiology were surprised to discover that the vanadium chromagen in these animals' blood reacts differently under varying temperatures.

Researchers discovered that vanadium chromagens dramatically altered the staining properties of the tissue samples.