http://www.poz.com/articles/tre_recombinase_hiv_761_12442.shtml?rss=true
I hope this could be it.
Scientists in Germany have constructed a custom enzyme that reverses the process by which HIV inserts its genetic material into a CD4 cell's DNA, suggesting that treatment with similar enzymes could potentially rid infected cells of the virus. According to laboratory study results published in Science, the mutated enzymecalled Tre recombinasewas able to snip HIV DNA out of the chromosomes of cultured human tissue.
I hope this could be it.