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Amino acid sequences of the PBD of PBP 1A from susceptible strain R6 (line 1) and isolate 3191 (line 2). Only those positions that differ from strain R6 are shown in line 2. The conserved amino acid sequence motifs (STMK, SRN, KTG) are underlined. Sequences are numbered according to the published sequence of Martin and coworkers (7).
