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Correlation between age of birds and DNA copy number in liver (A) and heart (B) of examined birds. The copy number values were expressed as log10 per 1 g and were plotted as the y-axis while age of birds in weeks was presented on the x-axis. Rs - rank Spearman's correlation coefficient. H0 - null hypothesis (no correlation between age of birds and DNA copy number), H1 - alternative hypothesis (significant correlation between two examined data sets).
