A third source of genomic diversity, gene conversions, are difficult to detect except by looking at very large genealogies. deCODE combined genomic and genealogical data on some 150,000 people to demonstrate that this process is, like crossover recombination, more common in women; is age dependent; and that male and female gene conversions tend to be complementary in type, so that they hold each other in check.  In 2019, deCODE utilized the genealogies, the large number of whole genome sequences (WGS) that it had completed in the preceding years, and genoytping data on the majority of the population, to publish a third recombination map of the genome. This is the first created using WGS data, and like the previous maps has been made openly available to the global scientific community.  