Craig Venter and his colleagues have devised a code that allowed them to plant 46 names, one web URL, and three poems to serve as "watermarks" within the synthetic code of the Mycoplasma mycoides JCVI-syn1.0 genome — making it a "code within the code," he said during a press conference. "One of the tenets of this field was to make absolutely sure we could distinguish synthetic DNA" from naturally occurring genetic code, he said.