title: Crystals in supporting cells of pineal organ in larval lamprey not likely to be pure guanine.
abstract: 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.
authors.affiliation: University of the West Indies, Kingston St. Andrew, Jamaica.
authors.forename: V B
authors.initials: VB
authors.lastname: Meyer-Rochow
authors.forename: D
authors.initials: D
authors.lastname: Stewart
mesh_terms: D000818:Animals; D003460:Crystallization; D006147:Guanine; D007798:Lampreys / Q000033:anatomy & histology / Q000254:growth & development / Q000378:metabolism*; D007814:Larva; D010870:Pineal Gland / Q000737:chemistry* / Q000648:ultrastructure; D013056:Spectrophotometry, Ultraviolet
chemical_list: D006147:Guanine