cell line cloned cell line REO: REO_0000397 YH, SS, MHB A cell line comprised of cells which can all be traced back to a single ancestor cell, and which therefore can be treated as identical. This can be used to study just the progeny of single cells. clonal cell line MHB 2013-07-16: This should be made into a defined class, using an axiom referencing a clonal cell expansion process, or a clonal cell line creation process.