photoreceptors, opsin, photoreceptor, exocytosis, porphyrins, plasminogen, gluconeogenesis, chloroplast, palmitate, chromophore, erythrocytes, proteins, melanocyte, oxidative phosphorylation, morphogen, proteolysis, crystallin, alanine, lucidum, neuromuscular junction, hydrogenase, organelle, spectrin, dpp, striated muscle, epithelia, ciliary, adrenal cortex, histidine, transduction, pyrimidines, peroxisome, phagocytosis, spermatogenesis, acetylation, sphingomyelin, epithelial tissue, superior colliculus, bile acid, endonuclease, keratins, osteoblast, cofactor, acinar, flavin, dephosphorylation, mesenchyme, cyclization, phospholipid, tyrosinase, proteoglycan, centrioles, nadph, putrescine, luciferase, glycoproteins, ribosomal rna, motoneurons, cytosol, globin, cilium, tetramer, luciferin, nephron, dimers, transmembrane, immunoreactivity, cysteine, glycosylation, ouabain, proteinase, tropomyosin, calmodulin, osteoclast, plastids, haem, transferase, polyamine, isoenzymes, dynein, cytochrome c, secretase, glycolipids, esterase, quinone, plasmon, tyrosine, ultrastructure, phosphatase, mitochondrion, isoprenoid, stilbene, astrocyte, fluorescence, receptors, nadh, superoxide, lymphatics, neurons, centromeres, avidin, myoglobin, chlorophyll, gh, haemoglobin, hemoglobin, protein, repressor, catalase, fibrinogen, thrombin, agglutinin, collagen, dna, melanin, myosin, pigment, prothrombin, rna, tsh

opsin, retinal, retinene

retinal purple, visual purple