Meyer-Rochow V B, Stewart D
University of the West Indies, Kingston St. Andrew, Jamaica.
Microsc Electron Biol Celular. 1992 Jun;16(1):87-8.
Spectrophotometry of larval pineal organs, digested in either 1 M HCl or 1 M NaOH, revealed peak absorbances at 253 nm and 268 nm, respectively. This result is not consistent with the view that the crystals found in lamprey pineals are chemically made of guanine.