40 Ferrazzi Ferrazzi P P Di Micco Di Micco P P Quaglia Quaglia I I Rossi Rossi LS LS Bellatorre Bellatorre AG AG Gaspari Gaspari G G Rota Rota LL LL Lodigiani Lodigiani C C Homocysteine, MTHFR C677T gene polymorphism, folic acid and vitamin B 12 in patients with retinal vein occlusion. The gene discussed is MTHFR; the disease is retinal vein occlusion.