tetrahydrobiopterin biosynthetic process (GO:0006729) tetrahydrobiopterin metabolic process (GO:0046146) pteridine-containing compound biosynthetic process (GO:0042559) diol biosynthetic process (GO:0034312) diol metabolic process (GO:0034311) pteridine-containing compound metabolic process (GO:0042558) organic hydroxy compound biosynthetic process (GO:1901617) polyol biosynthetic process (GO:0046173) organic hydroxy compound metabolic process (GO:1901615) polyol metabolic process (GO:0019751) 5 most frequent: GO:0006729,GO:0042559,GO:0034312,GO:0034311,GO:0046146