Two tracks but one race? Cancer genetics.
The tumor suppressor gene encoding the cyclin-dependent kinase inhibitor p16 has, remarkably, been found to encode a second protein, p19, with a distinct sequence translated from an alternative reading frame; like p16, p19 can block the cell cycle in G1 phase.
Sidransky
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Johns Hopkins University School of Medicine, Department of Otolaryngology - Head & Neck Surgery, Baltimore, Maryland 21205-2196, USA.
D000818:Animals; D002352:Carrier Proteins / Q000235:genetics*; D019941:Cyclin-Dependent Kinase Inhibitor p16; D005091:Exons; D016193:G1 Phase; D016147:Genes, Tumor Suppressor; D006801:Humans; D009369:Neoplasms / Q000235:genetics*
D002352:Carrier Proteins; D019941:Cyclin-Dependent Kinase Inhibitor p16