▁ 1 - ph osph otr ans fer ase . ▁Other ▁names ▁in ▁common ▁use ▁include ▁f uc ok in ase ▁( ph osph ory l ating ), ▁f uc ose ▁kin ase , ▁L - f uc ose ▁kin ase , ▁L - f uc ok in ase , ▁ATP : 6 - de ox y - L - f uc ose ▁ 1 - ph osph otr ans fer ase , ▁and ▁ATP : L - f uc ose ▁ 1 - ph osph otr ans fer ase . ▁F uc ok in ase ▁is ▁commonly ▁abbre vi ated ▁as ▁f uc - K . ▁ ▁This ▁en zym e ▁particip ates ▁in ▁f ruct ose ▁and ▁man n ose ▁met abol ism . ▁F uc ok in ase ▁is ▁the ▁only ▁en zym e ▁that ▁is ▁converting ▁L - f uc ose ▁to ▁f uc ose - 1 - ph osph ate ▁and ▁it ▁can ▁be ▁further ▁used ▁for ▁synth es izing ▁G DP - f uc ose , ▁which ▁is ▁the ▁don or ▁substr ate ▁for ▁all ▁f uc os yl trans fer ase . ▁▁▁ ▁L - F uc ok in ase ▁activity ▁can ▁be ▁detected ▁in ▁varied ▁t issues ▁within ▁an ▁animal . ▁For ▁instance , ▁r ats ▁and ▁m ice ▁contain ▁L - f uc ok in ase ▁widely ▁distributed ▁throughout ▁t issues ▁especially ▁higher ▁in ▁the ▁brain . ▁However , ▁the ▁levels ▁of ▁L - f uc ok in ase ▁in ▁the ▁brain ▁is ▁widely