Definition: "Rb211" refers to a specific type of protein found in blood, which is crucial for several critical functions. The term "rb211" represents "retinoblastoma-related protein 211", an encoded protein with many similarities to proteins involved in retinal damage and aging processes. It helps in regulating gene expression by inhibiting the activity of a key enzyme implicated in the synthesis of retinal pigment epithelium, which is essential for vision and visual perception.