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. Author manuscript; available in PMC: 2011 Mar 17.
Published in final edited form as: Prog Retin Eye Res. 2010 Jan 21;29(3):191–207. doi: 10.1016/j.preteyeres.2010.01.001
Cytokine/growth factor graphic file with name nihms239439ig1.jpg Ion channel graphic file with name nihms239439ig2.jpg
Chemical/toxicant graphic file with name nihms239439ig3.jpg Peptidase graphic file with name nihms239439ig4.jpg
Enzyme graphic file with name nihms239439ig5.jpg Transcription regulator graphic file with name nihms239439ig6.jpg
G-protein coupled receptor graphic file with name nihms239439ig7.jpg Transmembrane receptor graphic file with name nihms239439ig8.jpg
Group/complex/ graphic file with name nihms239439ig9.jpg other transporter graphic file with name nihms239439ig10.jpg
Growth factor graphic file with name nihms239439ig11.jpg Undefined graphic file with name nihms239439ig12.jpg