Heat map

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Heat map generated from DNA microarray data reflecting gene expression values in several conditions
Heat map generated from DNA microarray data reflecting gene expression values in several conditions

A heat map is a graphical representation of data where the values taken by a variable in a two-dimensional map are represented as colours. A very similar presentation form is a Tree map.

Heat maps are typically used in Molecular Biology to represent the level of expression of many genes across a number of comparable samples (e.g. cells in different states, samples from different patients) as they are obtained from DNA microarrays.


[edit] References

Eisen, M.B., Spellman, P.T., Brown, P.O. & Botstein, D. (1998). "Cluster analysis and display of genome-wide expression patterns". Proc. Natl. Acad. Sci. USA 95 (25): 14863–14868.  PMID 9843981 DOI:10.1073/pnas.95.25.14863

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