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Rhizobia growth curve and mass spectral identity. (A) Cell growth curves and (B) spectral identities (CCI value) of rhizobial strains S. meliloti USDA 1002T, R. leguminosarum USDA 2370T, M. tianshanense USDA 3306T, and B. yuanmingense CCBAU 10071T at different growth stages and storage periods. RS0D: pre-well grown media marked as 0 day, RT indicates room temperature (21 °C) storage, 4C indicates 4 °C storage. 1W – 3W means 1 to 3 weeks.
