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Partial dendrogram of unique E. coli strains isolated from epilithic periphyton at the DBC site. E. coli isolates with an HFERP fingerprint similarity of ≥92% were considered to be clones of the same strain. Four such E. coli strains, indicated by letters, were isolated from periphyton at the DBC site. The arrow indicates the 92% HFERP DNA fingerprint similarity value.
