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Characterization of growth of S-type, H-type, R-type and AL cells (a). Growth over time of S-type, H-type, R-type and AL clones in the presence of vitamin B12 (1000 ng l−1) (mean±s.e.m.) n=10. (b) Mean maximal growth rate, μ (h−1) of S-type, H-type, R-type and AL clones as calculated from panel (a). *P⩽0.05, **P⩽0.001 compared with the S-type clones (two-tailed Student's t-test) (mean±s.e.m.) n=10.
