SCN	Suprachiasmatic nucleus
TTFL	Transcription translation feedback loop
CLOCK	Circadian locomotor output cycles kaput
BMAL1	Brain and muscle arnt-like protein
PER	Period
CRY	Cryptochrome
CSC	Cancer stem cells
MSC	Mesenchymal stem cells
ESC	Embryonic stem cells
NSC	Neural stem cells
SVZ	Sub ventricular zone
SGZ	Sub granular zone
OPC	Oligodendrocyte progenitor cells
EMT	Epithelial to mesenchymal transition
MET	Mesenchymal to epithelial transition
CTC	Circulating tumor cells
M cells	Mesenchymal cancer cell
E cells	Epithelial cancer stem cell