Where the Biological Antimatter is?

We are surrounded by living beings made of matter. However, no living beings made of antimatter have ever been observed. This looks like a huge wrong prediction of our best theories about the physical fundaments of our world. In this work, the author advances a possible explanation of this mystery. This work discusses how we could explain the everyday experience of the absence of biological antimatter in our world by maintaining the validity of relativistic quantum mechanics but adopting the idea that an electron like a positron could interact electrically with itself. For simplicity, the discussion is based on the solution of the Grave de Peralta equation for the infinity well. This is the simplest model for a spatially localized relativistic quantum particle with mass. A semiquantitative discussion of the consequences of adding the interaction of the quantum particle with itself is presented. The matter-antimatter symmetry is broken by postulating that a particle electrically interacts with itself in a different way than the corresponding antiparticle interacts with itself.