Matrix usually refers to:
The term may also refer to:
Science
- Extracellular matrix, any material part of a tissue that is not part of any cell
- Germinal matrix, an embryonic brain tissue
- Matrix (biology), the material between animal or plant cells or the material in the inner membrane of a mitochondrion
- Matrix (chemical analysis), the remainder of the sample of which the analyte forms a part
- Matrix (geology), the fine grains between larger grains in igneous or sedimentary rocks
- Matrix isolation, a continuous solid phase in which particles (precipitates, etc.) are embedded
- Nuclear matrix, an insoluble fraction of the cell nucleus
- Osteon or bone matrix, a form of connective tissue found in bone
- Position-specific scoring matrix, which represents a pattern or motif in biological sequences
- Similarity matrix, which scores the similarity between two data points
- Substitution matrix, which estimates the rate at which each possible residue in a biological sequence changes to each other residue over time
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