Table 1 Primers used in this study

HS-1com1

TGCTCCATACAAGCCAACC

HAS-2com

ATCATCTGCTGCTTGGTGC

AD-1

NGTCGASWGANAWGAA

AD-2

GTNCGASWCANAWGTT

AD-3

WGTGNAGWANCANAGA

HS-1

GGCCGTGGTTGGCTTGTATGGAGCAGCAGA

436 bp from nick site in RB^a

HS-2

TGGTCTTGACCAACTCTATCAGAGCTT

336 bp from nick site in RB

HS-3

GGACCGATGGCTGTGTAGAAGTA

193 bp from nick site in RB

HS-4

CTCGCCGATAGTGGAAACC

170 bp from nick site in RB, for sequencing

HAS-2

GCACCAAGCAGCAGATGAT

373 bp from nick site in LB^b

HAS-3

AATAATGTCCTCGTTCCTGTCTGCTAATAA

354 bp from nick site in LB

HAS-4

CCGCCTGGACGACTAAAC

225 bp from nick site in LB

HAS-5

GACCTCCACTAGCTCCAGCC

187 bp from nick site in LB, for sequencing

pks-F_Nhe

taggctagcGTAAGCTCACCGTCAAGGCA

pks-R_Nhe

ctggctagcAGATCCTAGAGACCCGGGAC