We also observe that members of human chemokine receptors, involved in immune response, and most of nucleotide-lipid receptors (except opsins) do not have counterparts in Drosophila.
Comparable measures for C. elegans are more difficult to obtain, because most estimates of nucleotide diversity identify too few replacement site polymorphisms to accurately estimate πa.
The mRNA nucleotides coding for proteins are 'translated' in groups of three, and most of these nucleotide triplets instruct for a specific amino acid to be added to the newly forming protein.
Since most of the nucleotide changes in the HA1 and NA genes were silent, the rate of amino acid changes was clearly lower than the changes at nucleotide level.
However, most of these nucleotide substitutions were silent mutations.
Most of the nucleotide diversity was observed between samples of potato and tobacco R. solani AG-3.
Figure 6 shows that most of the nucleotide variation in groups 1, 2 and 3 occurred in HV1.
As with the rht1 homologs, most of these nucleotide substitutions (>57%) were found in the noncoding region.
Most of the nucleotide changes were G to A or C to T, as expected for EMS-induced transitions.
An analysis of the DNA polymorphisms at each locus, suggested that most of the nucleotide diversity occurred between samples of potato and tobacco R. solani AG-3.
Both viruses were subsequently considered different genotypes of the same virus because they were found to share most of the nucleotide and amino acid sequences [ 3].
