>sp|A2BQW7|URE2_PROMS Urease subunit beta OS=Prochlorococcus marinus GN=ureB MSNLIPGEIIPEQGQIELNLSKQVKTVTVSNSGDRPVQVGSHYHFYEANKALIFDREITY GMRLDIPAGTAIRFEPGDTTDVKLVPFSGLRNAYGFNSLVNGSLNS