There are different extensions of the standard model. One of them is called Minimal Supersymmetric Standard Model. It allows for supersymmetry, and can transform one kind of particle, the bosons, into the other, the fermions. In condensed matter physics, bound Majorana fermions can appear as quasiparticle excitations—the collective movement of several individual particles, not a single one, and they are governed by non-abelian statistics.