Results of Streptococcus pneumoniae tmRNA specific NASBA amplifications. A) Average RNA quantity after NASBA amplification with different aaUTP salts. Error bars show ± one SD of these averages. Control value stands for RNA amount in NASBA reaction without aaUTP addition. B) Comparison of average relative microarray signal intensities from NASBA experiments conducted with a range of concentrations of two different aaUTP. Error bars show ± one SD of these averages. Signal intensity value 1 stands for average signal intensity of every dilution series experiment including data from both used aaUTP salts.