A) Superimposition of hNaa60 (yellow) with hNaa50 (cyan), SpNaa10 (orange) and ssNAT (white). CoA-Ac-MKAV7 bound to hNaa60 is shown in green sticks. B) Superimposition of hNaa60 (yellow), hNaa50 (cyan), SpNaa10 (orange) and SsNAT (white) β3–β4 loop. C) Superimposition of hNaa60 (yellow), hNaa50 (cyan), SpNaa10 (orange) and SsNAT (white) β6–β7 loop containing a hairpin structure with two shorts strands (β6′ and β7′).