The aqueous humor and vitreous humor were used as collected. The retina choroid and iris-ciliary bodies used in this study were homogenized in ice-cold IPBS in an ice bath using a TISSUEMISER (Fisher Scientific). The homogenates were then centrifuged at 17,000g at 4°C for 15 minutes. The protein contents of the supernatants were determined according to the method of Bradford34 (link) and were adjusted to approximately 1 mg/mL.