The three models have to be calibrated to an overall similar evolutionary divergence time, and to similar base compositions.

However, variability in base composition can skew occurrences of arbitrary sequences away from their expected distributions.

In most cases nucleation agents are added to the base composition of the glass-ceramic.

This describes only a global feature of the base composition in a single DNA strand.

Studies on template activity and base composition.

Thus, whatever the base composition of a genome, the acquired genes are more A+T-rich than their host genome.

Additionally, the base composition is skewed due to the biased frequencies of C and T within the samples.

Z is correlated with the base composition of the underlying DNA.

That is, there is no change in base composition between a sequence and itself.

But this hypothesis is not sufficient to explain the observed pattern of base composition across species.