▁External ▁links ▁▁▁▁ ▁Category : 1 9 8 8 ▁films ▁Category : 1 9 8 0 s ▁science ▁fiction ▁action ▁films ▁Category : English - language ▁films ▁Category : Ital ian ▁science ▁fiction ▁action ▁films ▁Category : N orth ▁Korean ▁science ▁fiction ▁films ▁Category : Fil ms ▁directed ▁by ▁Ferd in ando ▁Bald i <0x0A> </s> ▁The ▁Arc ▁system ▁stands ▁for ▁An ox ic ▁Res p ir atory ▁Control ▁system . ▁ ▁It ▁is ▁an ▁example ▁of ▁a ▁two - component ▁system , ▁in ▁that ▁it ▁has ▁a ▁sensor ▁mole c ule ▁and ▁a ▁response ▁reg ulator . ▁ ▁The ▁Reg ulation ▁of ▁Vari ous ▁Gen es ▁It ▁has ▁been ▁determined ▁that ▁the ▁Arc ▁system ▁regul ates ▁as ▁many ▁as ▁ 3 0 ▁gen es , ▁with ▁repr ession ▁of ▁the ▁following ▁examples : ▁cy to chrome ▁o ▁ox id ase , ▁cy to chrome ▁d ▁ox id ase , ▁and ▁various ▁gl u con e ogen ic ▁en zym es , ▁such ▁as ▁for ▁the ▁g ly ox yl ate ▁cycle , ▁and ▁fat ty ▁acid ▁ox id ation . ▁It ▁also ▁indu ces ▁the ▁expression ▁of ▁Py ru v ate ▁form ate ▁ly ase . ▁ ▁Mechan ism ▁of ▁the ▁Arc ▁System ▁The ▁Arc ▁system ▁uses ▁a ▁two ▁component ▁regul atory ▁system . ▁ ▁The ▁sensor , ▁Arc B , ▁is ▁an ▁unusual ▁hist id ine ▁kin ase ▁in ▁that ▁it ▁contains ▁three ▁signal ing ▁domains . ▁ ▁Arc B ▁sens es ▁the ▁re do x ▁state ▁of ▁the ▁cell ,