▁class ▁is ▁L - c yst e ine : N AD + ▁ox id ored uct ase . ▁Other ▁names ▁in ▁common ▁use ▁include ▁c yst ine ▁re duct ase ▁( N AD H ), ▁N AD H - dependent ▁c yst ine ▁re duct ase , ▁c yst ine ▁re duct ase ▁( N AD H 2 ), ▁and ▁N AD H 2 : L - c yst ine ▁ox id ored uct ase . ▁ ▁This ▁en zym e ▁particip ates ▁in ▁c yst e ine ▁met abol ism . ▁ ▁References ▁▁▁▁▁▁▁▁ ▁Category : EC ▁ 1 . 8 . 1 ▁Category : N AD H - dependent ▁en zym es ▁Category : En zym es ▁of ▁unknown ▁structure <0x0A> </s> ▁R ▁v ▁Department ▁of ▁Trade ▁and ▁Indust ry , ▁ex ▁parte ▁Broadcast ing , ▁Entertainment , ▁Cin emat ographic ▁and ▁Theatre ▁Union ▁( 2 0 0 1 ) ▁C - 1 7 3 / 9 9 ▁is ▁a ▁European ▁labour ▁law ▁and ▁UK ▁labour ▁law ▁case ▁concerning ▁the ▁Working ▁Time ▁Direct ive , ▁which ▁is ▁relevant ▁for ▁the ▁Working ▁Time ▁Reg ulations ▁ 1 9 9 8 . ▁ ▁Fact s ▁The ▁original ▁Working ▁Time ▁Reg ulations ▁ 1 9 9 8 ▁provided ▁for ▁a ▁ 1 3 - week ▁qual ifying ▁period ▁at ▁work ▁before ▁one ▁could ▁benefit ▁from ▁its ▁protection . ▁This ▁restriction ▁was ▁challeng ed ▁by ▁the ▁Broadcast ing , ▁Entertainment , ▁Cin emat ograph ▁and ▁Theatre ▁Union , ▁because ▁there ▁was ▁nothing ▁about ▁it ▁in