Answer:
i believe it is energy path
Explanation:
It would turn into GCCATG
Since there is no sequal to GATTACA, they basically just leave it up to your imagination to come up with the rest.
This same cinematic logic was put into place with the movie, "The Client". At the end, you are left you imagine for yourselves what you wish happens.
I hope this helped! Have an amazing day :)
