Table 1. Cell lines included in the study.
| Cell line | Cell Type | Source/Reference | Karyotype/Notes |
| human dermal fibroblast (HDF) | primary neonatal foreskin fibroblasts | ATCC | 46,XY |
| HT1080 | fibrosarcoma | ATCC | 46,XY/92,XXYY |
| LT690 | lymphoblastoid | Ref. 15 | 46,XY |
| t60-12 (somatic cell hybrid 1) | mouse-human hybrid; L cell derived | Ref.42 | contains single human active X chromosomes |
| Aha-11aB1 (somatic cell hybrid 2) | mouse-human hybrid; L cell derived | Ref. 42 | contains single human active X chromosome |
| HTM18TC8 | hamster-human hybrid | Refs. 21, 22 | contains single human X chromosome |
| FA3Wg8-4 | hamster-human hybrid | Refs. 21, 22 | truncated X chromosome from HTM18TC8 line |