Putative fructose-1,6-bisphosphatase or related enzymes of inositol monophosphatase family. These are Mg++ dependent phosphatases. Members in this family may have fructose-1,6-bisphosphatase and/or inositol-monophosphatase activity. Fructose-1,6-bisphosphatase catalyzes the hydrolysis of fructose-1,6-biphosphate into fructose-6-phosphate and is critical in gluconeogenesis pathway.