Cells were a part of many living organisms' bodies.
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The Doctor once explained, that amino acids would fuse to form cells, which would eventually evolve into plants and animals. (TV: City of Death)
A collection of cells were a cell culture. (COMIC: Culture Shock)
ARC, a companion of the Eleventh Doctor, did not have cells in his body. (COMIC: The Infinite Astronaut)
The process of progenation involved taking a sample of diploid cells, splitting them into haploids, recombining them in a different arrangement and growing the result into an offspring. (TV: The Doctor's Daughter)