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The section of the text in which this word appears is: Herstellung von Kalibrationsproben
'In 7 Ultrafiltrationsröhrchen werden jeweils 1 ml Leerplasma (Heparinplasma) pipettiert und mit je 100 µl der Arbeitslösungen STD 4a bis 10a versetzt.
The text is about determining the amount of certain substances in human plasma.
Any ideas would be appreciated.