Lineage tracing is a powerful tool to study development, tissue homeostasis, aging, and disease progression. Over the past decades, lineage tracing techniques have progressed substantially by employing new genetic engineering tools. However, due to their invasive nature, these approaches are difficult to apply to humans. Although endogenous DNA mutations can be used for in vivo lineage tracing in humans, their extremely low mutation rate presents substantial technical challenges. Mitochondrial DNA mutations are an alternative, but their inheritance may suffer from neutral drift or undergo both positive and negative selection, and their analysis is plagued by excessive data noise. Thus, developing non-invasive, high-resolution lineage tracing methods for human tissues is crucial.

The Korea Research Institute of Standards and Science (KRISS, President Dr. Lee Ho Seong) has successfully developed a chlorinated graphene (Cl-Gr) gas sensor that uses readily available saltwater to rapidly detect and recover from harmful gases at room temperature. Because the sensor can operate without a separate heating element, it significantly improves the prospects for practical gas sensors in compact devices, where their use has long been limited by power consumption and heat generation.