||Nishiuchi Y et al., Chemical synthesis of the precursor molecule of the Aequorea green fluorescent protein, subsequent folding, and development of fluorescence. Proc Natl Acad Sci U S A. 1998 Nov 10 95(23):13549-54. p.13549 left column 2nd paragraphPubMed ID9811837
|| Morise H, Shimomura O, Johnson FH, Winant J. Intermolecular energy transfer in the bioluminescent system of Aequorea. Biochemistry. 1974 Jun 4 13(12):2656-62.PubMed ID4151620
||p.13549 left column 2nd paragraph:"The bioluminescent jellyfish Aequorea victoria produces a greenish luminescence from the margin of its umbrella by using two proteins: a Ca2+-binding protein, aequorin (21.4 kDa) and a chromophore-bearing green fluorescent protein (GFP 27 kDa) (primary source). On binding Ca2+, aequorin undergoes an intramolecular reaction, yielding a blue fluorescent protein in the singlet excited state, which transfers its energy by resonance to GFP. The acceptor of energy in GFP is a chromophore consisting of an imidazolone ring structure (refs 2–4)."