Reverse transcriptase is characteristic of retroviruses, including HIV (human immunodeficiency virus), the virus responsible for AIDS (acquired immunodeficiency syndrome). All retroviruses encode a polymerase enzyme in their pol gene that is both necessary and sufficient for the replication of their RNA genomes.
PDO positive phase global pattern. The Pacific Decadal Oscillation (PDO) is a robust, recurring pattern of ocean-atmosphere climate variability centered over the mid-latitude Pacific basin.
The pattern of surface temperatures in the hiatus decades is very similar to the negative phase of the Interdecadal Pacific Oscillation (IPO). So, despite some discrepancies, the model implicates the IPO as one of the causes for the slower surface warming.