The distribution of potential marker enzymes or
proteins for bacteroid or plant cell compartments obtained in each of
the 10 fractions that comprised a nonaqueous gradient of lyophilized
nodule tissue. A, A gradient in which assays were carried out for HBD,
the heme group of Lb (Lbheme), the apoprotein of Lb
(Lbprotein), PEPC, and xanthine dehydrogenase (XDH). B, A
gradient in which assays were carried out for PEPC and GDH.