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Cryoprotection of LDH by rye apoplastic proteins and BSA. LDH was frozen and thawed eight times in the presence of either BSA or apoplastic proteins isolated from cold-acclimated winter rye leaves. LDH activity was measured spectrophotometrically as the oxidation of NADH and calculated as a percentage of the unfrozen control. The data are presented as means ± se; n = 4.
