The Cell Line Ontology (CLO) is a community-based ontology of cell lines. The CLO is developed to unify publicly available cell line entry data from multiple sources to a standardized logically defined format based on a consensus design pattern.

The website for CLO ontology is here:
https://obofoundry.org/ontology/clo.html  

Reference:

Sarntivijai S, Lin Y, Xiang Z, Meehan TF, Diehl AD, Vempati UD, Schürer TC, Pang C, Malone J, Parkinson H, Liu Y, Takatsuki T, Saijo K, Masuya H, Nakamura Y, Brush MH, Haendel MA, Zheng J, Stoeckert CJ, Peters B, Mungall CJ, Carey TE, States DJ, Athey BD, He Y. CLO: The Cell Line Ontology. Journal of Biomedical Semantics. 2014, 5:37. doi:10.1186/2041-1480-5-37. PMID: 25852852. PMCID: PMC4387853.