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* The 2010 version of the Oxford University Press style guide for authors in life sciences gave the following guidance " Use the Système international d ' unités ( SI ) wherever possible ...
The Dalton ( Da ) or more conveniently the kDa is a permitted non-SI unit for molecular mass or mass of a particular band in a separating gel.
" At the same time, the author guidelines for the journal " Rapid Communications in Mass Spectrometry " stated " The Dalton ( Da ) is a unit of mass normally used for the molecular weight ... use of the Da in place of the u has become commonplace in the mass spectrometry literature ...
The " atomic mass unit ", abbreviated " amu ", is an archaic unit ".

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