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Analysis of the gapA operon. (A) Western blot of R low and R high reacted with anti-GapA serum. The molecular mass markers are represented in kilodaltons. (B) Adenine insertion sites at positions 105 and 907 in gapA of R high generating TAA termination codons. (C)RT-PCR analysis utilizing primer pairs I and J in R high and R low. (D) Stem-loop structures found downstream of the TAA stop codon at positions 120 and 326.
