In Biology and Health Sciences
- Cancer cluster, in biomedicine, an occurrence of a greater-than-expected number of cancer cases
- Cluster headache, a neurological disease that involves an immense degree of pain
- Cluster of differentiation, protocol used for the identification and investigation of cell surface molecules present on white blood cells.
- Winter cluster, in beekeeping, a well-defined cluster of honey bees in cold temperatures
- Cluster (epidemiology), a grouping of cases of disease
- Genetic cluster, a group of genes (or proteins, or metabolites) whose expression or concentration is similar across a range of conditions
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