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This code system http://hl7.org/fhir/substance-weight-method defines the following codes:

Code | Display
SDS-PAGE | SDS-PAGE (sodium dodecyl sulfate-polyacrylamide gel electrophoresis)
Calculated | calculated
LighScattering | light scattering
Viscosity | viscosity
GelPermeationCentrifugation | gel permeation centrifugation
End-groupAnalysis | End-group analysis
End-groupTitration | End-group titration
Size-ExclusionChromatography | Size-exclusion chromatography