The CellGen project is composed of two main parts. The first part investigates whether cell cultures accumulate mutations with progressive number of passages. One of the advantages of cell culture is to provide best quality of DNA/RNA and metaphases. Hence, we expect that cell culture will experience a renaissance in the light of high throughput sequencing techniques. However, it is still not clear how the number of passages (i.e., the number of times cells are transferred from vessel to vessel) can affect genetic and chromosomal composition.