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Physical and genetic map of the genomic region of Rhizobium leguminosarum bv. trifolii 24.2 carrying pssB and pssA genes. The green and blue arrows below the map show the direction of transcription of pssB and pssA, respectively. E, EcoRI, H, HindIII. P1 and P3 are promoter sequences for the pssA gene. Lines below the arrows indicate fragments of the pssA regulatory region cloned upstream of lacZ, which are present in individual pssA-lacZ transcriptional fusions pPA1-pPA4.
