Different biological contexts of pericentromeric satellite expression. Physiological expression of pericentromeric satellite repeats has been reported during cell cycle, aging cellular senescence, differentiation and development. Expression levels are detectible but low. Pathological expression has been reported upon cellular stress and in cancer, and expression levels are often aberrantly overexpressed. The size and orientation of the transcripts are indicated when known. In addition, putative functions of the noncoding transcripts in different biological contexts are mentioned and discussed in the text.