The Leonardo da Vinci DNA Project—members of which previously extracted samples from six living men who share Leonardo’s ancestry—now believe a chalk drawing called “Holy Child” holds the secret to unlocking the artist’s genome. However, not all in the art world are convinced, particularly as “Holy Child” had previously been attributed to a different artist entirely. Related Story Surgeon Discovers New Math in Da Vinci DrawingBut there’s still a chance they’re wrong about this DNA belonging to Leonardo at all. However, using “Holy Child” as the source has caused those skeptical of the endeavor some degree of concern. Relying on the Y-chromosome is crucial in this case, as Leonardo da Vinci had no direct descendants.