Figure 4.

Chemical interconversion of mRG-II and dRG-II-B from B-deficient and ¹⁰B-treated C. album cells. A, SEC-RI profile of the saponified and polygalacturonase-treated phosphate-buffer-soluble material from the AIR of C. album cells grown in the absence of added boric acid. B, SEC-RI profile of the extract shown in A after treatment for 24 h at pH 3.5 with boric acid (1 mm) and lead nitrate (1 mm). C, SEC-RI profile of the saponified and polygalacturonase-treated phosphate-buffer-soluble extract from the AIR of B-deficient C. album cells grown for 10 min in the presence of ¹⁰B boric acid (100 μm). D, SEC-RI profile of the extract shown in C after treatment for 30 min at pH 1.0.