After getting a sample of T-Rex DNA, she separates the DNA from the junk.
She swabbed your arm and injects the DNA into you.
You felt your cloths rip as you started growing muscles as you grew taller.
You then winced as the changes continues to run their course.
You painfully scrunched forwards as talons ripped out from your
fingernails while your muscles expanded. There was a rip and you reached at the base of your spine and felt a reptillian tail grow out.
The last changes were finished as your skin became light green smooth scales.
You looked at the closest reflective surface to see that you're 10'4" tall with 750 pounds of muscle.