@@Biochemistrybasics worth it...for PGs u can add annotations in video like Dubin Johnson syndrome defective MRP -2 protein ( multidrug resistance like protein a type of ABC -ATP binding cassette protein ) and Rotor ' s syndrome defect in OAT1B1 and OAT1B3 ( organic anion transport protein) that wl help in uptake of urobilinogen to enterohepatic circulation