Animals have evolved a greater diversity of cell types in a multicellular body (100–150 different cell types), compared
with 10–20 in plants, fungi, and protists.[5] The exact number of cell types is, however, undefined, and the Cell Ontology, as of 2021, lists over 2,300 different cell types.[6]
^Usoskin D, Furlan A, Islam S, Abdo H, Lönnerberg P, Lou D, Hjerling-Leffler J, Haeggström J, Kharchenko O, Kharchenko PV, Linnarsson S, Ernfors P (January 2015). "Unbiased classification of sensory neuron types by large-scale single-cell RNA sequencing". Nature Neuroscience. 18 (1): 145–53. doi:10.1038/nn.3881. PMID25420068. S2CID205437148.
^Häring M, Zeisel A, Hochgerner H, Rinwa P, Jakobsson JE, Lönnerberg P, La Manno G, Sharma N, Borgius L, Kiehn O, Lagerström MC, Linnarsson S, Ernfors P (June 2018). "Neuronal atlas of the dorsal horn defines its architecture and links sensory input to transcriptional cell types". Nature Neuroscience. 21 (6): 869–880. doi:10.1038/s41593-018-0141-1. PMID29686262. S2CID5057143.
^Margulis L; Chapman MJ (2009). Kingdoms and Domains: An Illustrated Guide to the Phyla of Life on Earth (4th ed.). Amsterdam: Academic Press/Elsevier. p. 116.
^Osumi-Sutherland, David; Xu, Chuan; Keays, Maria; Kharchenko, Peter V.; Regev, Aviv; Lein, Ed; Teichmann, Sarah A. (2021-06-28). "Cell type ontologies of the Human Cell Atlas". Nature Cell Biology. 23 (11): 1129–1135. arXiv:2106.14443. doi:10.1038/s41556-021-00787-7. PMID34750578. S2CID235658396.