Phycocyanobilin (PCB)是一种开链四吡咯发色团，共价键合到 C-藻蓝蛋白(C-Phycocyanin, C-PC)的两条多肽链上，C-藻蓝蛋白是螺旋藻(Spirulina platensis)中最具代表性的胆蛋白。其保护细胞的机制包括减少氧化应激损伤，这可能有助于其治疗神经退行性疾病的临床疗效。 Phycocyanobilin (PCB) is an open-chain tetrapyrrole chromophore covalently bonded to both polypeptide chains of C-Phycocyanin (C-PC), the most represented biliprotein of Spirulina platensis, the mechanisms by which it protected cells included the reduction of oxidative stress damage, which could contribute to its clinical efficacy for the treatment of neurodegenerative diseases.