This story is a bit short on details; are these generated sperm cells haploid (having unpaired chromosomes, only half of the full complement of an multicelled adult) or diploid, like a *fertilized* egg rather than regular sperm? Was the stem cell donor male or female?

Diploid and/or female-derived sperm cells could force some boggling new permutations to be considered in the debates over stem cell research, therapeutic cloning, and engineered reproduction.