Abstract
The thioredoxin system is a critical regulator of redox processes across eukaryotes, but precise monitoring of its activity is made difficult by the lack of selective cellularly active probes. In this issue of <i>Chem</i>, Thorn-Seshold and co-workers utilize a rational design approach to develop a highly selective selenylsulfide probe for monitoring thioredoxin reductase activity in live cells.
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