If you want to look at the cells synthesizing melatonin in the retina, the
best way will probably to look for the enzymes synthesizing melatonin.
That's the way that melatonin synthesis has actually been proven in the
retina, if I remember well. But beware, the N-acetyltransferase (NAT) and
the hydroxyindolyl-O-methyl-transferase (HIOMT) doing the job in the retina
are apparently not the same enzymes than in the pineal gland. At least, the
riboprobes that work in the pineal do not work in the retina.

Paul

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Paul Klosen, PhD
CNRS UMR 7518 Neurobiologie des Fonctions Rythmiques et Saisonnieres
Universite Louis Pasteur
12 rue de l'Universite
F-67000 Strasbourg, FRANCE
tel: 03.88.35.85.04    fax: 03.88.24.04.61
===============klosen@neurochem.u-strasbg.fr==============================