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(A) Larger colony (4,376 ± 741 cm2), L-centre: colony centre, L-33: 33.3% of the longitudinal radius length, L-66: 66.6% of the longitudinal radius length, L-edge: colony edge. (B) Smaller colony (1,410 ± 88 cm2), S-centre: colony centre, S-50: 50% of the longitudinal radius length, S-edge: colony edge (S-edge). For each size class, n = 10.
