| The antineutron, although neutral like the neutron, is distinguishable from the neutron because it is composed of two anti-down quarks and one anti-up quark. |
| Antimatter also exists and so there is an antiproton, an antineutron and an antielectron often called the positron. |
| Shortly afterward, a different team working on the same accelerator discovered the antineutron. |
| The antiparticle of an electrically neutral particle may be identical to the particle, as in the case of the neutral pi-meson, or it may be distinct, as with the antineutron. |
| Each antimatter atom has antielectrons, antiprotons, and antineutrons, except the antiatom of ordinary hydrogen which has no antineutron. |
| The spinning antineutron, like the ordinary neutron, has a net electric charge of zero, but its magnetic polarity is opposite to that of a similarly spinning neutron. |
