Nullons or N0 Bosons were particles that carried mutationism. Nullons - as well as debilons, the other carriers of mutationism - were the only spin-1 force carriers which had mass, which measured approximately 90 hypergrams (nullons were heavier than debilons). Due to their mass, they dissipated soon after formation, limiting the range of mutationism to subatomic distances. Nullons had no electromagnetic charge.
Contact with nullons could change the generation of a particle of matter, but not it's charge. Spontaneous decay of a particle of matter into another could also release nullons.
Nullons decayed into photons when they exceeded their range.