For nuclei containing less than 40 particles, these numbers are usually about equal.

Some astronomers believe that active nuclei contain large black holes.

Initially the nucleus was large in size and contained open chromatin.

This nucleus contains all of the genetic information needed to produce the organism it was removed from.

In addition if this is so, these galactic nuclei must contain bodies of a huge mass and unknown nature.

The nucleus contains one maternal set of genes and two paternal sets.

The nucleus might also contain one or more neutrally-charged particles called neutrons.

In the first nucleation stage, a small nucleus containing the newly forming crystal is created.

Besides the nucleolus, the nucleus contains a number of other non-membrane-delineated bodies.

The nucleus of the most common isotope of lead contains 82 protons, not 208.