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A study of hadron production at the nucleon-antinucleon threshold has beenperformed with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. A veryfast rise with about 1 MeV width has been observed in the $e^+e^- \to p\bar p$cross section. A sharp drop in the $e^+e^- \to 3(\pi^+\pi^-)$ cross section hasbeen confirmed and found to have a less than 2 MeV width, in agreement with theobserved fast rise of the $e^+e^- \to p\bar p$ cross section. For the firsttime a similar sharp drop is demonstrated in the $e^+e^- \to K^+K^-\pi^+\pi^-$cross section. The behavior of the $e^+e^- \to 3(\pi^+\pi^-),~K^+K^-\pi^+\pi^-$ cross sections cannot be explained by an interference of anyresonance amplitude with continuum, therefore this phenomenon cannot be due toa narrow near-threshold resonance. No such structure has been observed in the$e^+e^- \to 2(\pi^+\pi^-)$ cross section.

Observation of a Fine Structure in $e^+e^- \to$ hadrons Production at the Nucleon-antinucleon Threshold