SUMMARY: The total soluble proteins were extracted from 38 strains of pink-pigmented facultatively methylotrophic bacteria (PPFMs) and the similarity between them was investigated by polyacrylamide gel electrophoresis. Normalized densitometric recordings of the protein profiles were computer-compared by two fundamentally different modes: peak search and position analysis, and correlation coefficient analysis. Factors influencing the reproducibility of the system were investigated. The data indicated that the PPFMs were more heterogeneous than previously believed. The results from both analyses showed a high degree of congruence with each other and with data from previous studies.


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