Apart from these space-time symmetries, it also has internal symmetries.

They have very simple tissue organization, with only two layers of cells, external and internal and radial symmetry.

Fields may have internal symmetries in addition to spacetime symmetries.

One may also make a classification of the charges of the fields under internal symmetries.

It states that "space-time and internal symmetries cannot be combined in any but a trivial way".

This is always a global internal symmetry of any quantum field theory with fermions and corresponds to a rotation by 2π.

The third diagram shows some of the internal symmetry of the structure.

This is an example of an internal symmetry, in contrast to a space-time symmetry.

Although such fields transform as a vector under the internal symmetry, they are still Lorentz scalars.

This supersymmetry did not involve spacetime, that is it concerned internal symmetry, and was badly broken.