The Valyrian blood chromosome

The strong bond between dragonlords of Valyrian blood and their tamed dragons was a long-lasting scientific enigma, which was recently revealed. It was found that people of Valyrian blood possess a 24th chromosomal pair, which contains multiple genes, responsible for pheromone signaling between the two species, as well as the distinct features of Valyrians over other people. Moreover, it was found that this chromosome, called the Valyrian chromosome is also shared by the dragons themselves and undergoes horizontal transfer and homologous recombination during a process, known as “blood-hatching”.