The Importance of Side Effects in Genetic Modification

Are we talking about some unforeseen? Let's not call it consequence, but like byproduct of fixing the thing. For instance, what if there's something that changes the way people smell you wouldn't recognize that from photographs,. But you might get near them and it's something that could even be unconscious that trips you right? I don't know. It really depends on what you pick at the at the genetic modification store Right, which now in my head is like a basket Robbins.