We are pleased to announce that the winner of the award for the Best Paper published in 2003 is Jochen Kirchner for the paper entitled `Live cell monitoring of tyrosine phosphorylation' (Kirchner et al., 2003).

The prize, $1000, is awarded annually to the first author of the paper that is judged by the Editors and Editorial Board to be the best published in the journal that year. To be considered for the prize, the first author must be a student or post-doc of no more than five years' standing.

Jochen Kirchner was born in Bad Godesberg, Germany. He studied both biochemistry and mathematics at Tübingen University and for his PhD joined the laboratory of Manfred Schliwa at the Adolf-Butenandt Institute for Cell Biology in Munich. There, he studied the interaction of the microtubule motor protein kinesin with its presumed cargo. He first tried to purify a kinesin-binding activity...

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