The pentapeptide QYNAD does not block voltage-gated sodium channels [Comment on]

Partial retraction - statement 'We have now installed the more sensitive ion trap technique for mass detection and quantification and find QYNAD and pyQYNAD in CSF samples of all assessed MS and of GBS patients, but not of controls' from letter retracted; P Aulkemeyer named responsible for 'scientific fraud';