3-dimensional in situ hybridization Analysis of Telomeres and Telomerase Collagen or Gelatin Coating of Tissue Culture Surfaces Culture of Human Bronchial Epithelial Cells Culture of Myoblasts Droplet Digital TRAP Feeder Layer Tissue Culture Human Colonic Epithelial Cell Medium Immortalization Tools Infection with Lentivirus Infection with Retrovirus Lentivirus and Retrovirus 101 Low Oxygen Tissue Culture Chambers Matrigel Invasion Assay Metaphase Spread Quick DNA Prep and TRF Analysis Sister Chromatid Exchange Telomere Dysfunction Induced Foci (TIF) Assay Telorun Analysis of Mean TRF Length Universal STELA