Crossword Clue:

a secondary nucleus

Answer	Crossword Clue
ATOMICSTRUCTURE	It includes a nucleus
PROTON	Part of a nucleus
RNA	Part of a nucleus

ATOM	Bit with a nucleus
CADRE	Nucleus of a military group.
DNA	Material in a cell's nucleus
NETKNOT	Part of a cell nucleus
HARDCORE	Unyielding nucleus of a group
RNA	Part of a cell nucleus