an increase in cellular gsh level was produced by the addition of n-acetylcysteine ( nac ) , a carrier of cysteine across cell membranes , into the culture medium , while a decrease in gsh level was produced by the addition of l-buthionine- ( r , s ) -sulfoximine ( bso ) , a specific inhibitor of gsh synthetase .
C0007634
cellular
C0007603
cell membranes