Visual coaggregation scores for different pairs of strains. Cells were grown to stationary phase and harvested after 36, 71, or 144 h. Sphingomonas sp. strain 2.10 and Afipia sp. strain 2.2 (36 h) showed a score of 0 (no coaggregation), P. marcusii 2.21 and B. natatoria 2.3 (72 h) showed a score of 1+, Sphingomonas sp. strain 2.18 and Afipia sp. strain 2.2 (144 h) showed a score of 2+, B. natatoria 2.1 and Nocardioides sp. strain 2.20 (144 h) showed a score of 3+, and B. natatoria 2.1 with M. luteus 2.13 (72 h) showed a score of 4+. Bar, 1 cm.