Figure 4.

Regression analysis of the GC content in dNTPs and DNA. The GC content in the dNTPs (y-axis) is plotted against the genomic GC content (x-axis) and the Pearson correlation coefficient and the corresponding P value of a linear regression are calculated. Every white circle represents the average of three measurements. The green circle comprise all dicotyledonous species (A. thaliana, P. vulgaris, S. lycopersicum) and the bryophyte (P. patens), the orange circle encompasses the monocotyledonous species (A. officinalis, A. sativa, H. vulgare, O. sativa, T. aestivum, and Z. mays) and the purple circle alga (C. reinhardtii, M. scalaris, and V. carteri). * indicates an estimate of genomic GC content by extrapolation from known codon DNA sequences (R² without this datapoint is 0.73).