Humans&#x2F;mammals have 50 times more coding DNA than simple fungi they&#x27;ve syntesized so far. Plus natural mammal DNA is usually subdivided into multiple pieces on a chromosome called introns. It is unclear how important the non-coding inbetween DNA is.
Homever nearly the entire lab mouse genome has been purified into single pieces called coding DNA and can be purchased from labs.  Maybe they&#x27;ll try synthezing a mouse first.  The human case shouldnt be more difficult.