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& Culpepper, R

Epithalon is commonly supplied as a lyophilized (freeze-dried) powder, a format chosen to help maintain stability during storage and transportation prior to laboratory preparation

Site-specific PEGylation of interleukin-2 enhances immunosuppression via the sustained activation of regulatory T cells

doi: 10.1042/cs0800497

These are: RRR RRS RSS RSR SRR SSR SSS SRS The two forms of alpha-tocopherol are designated (these are placed before alpha-tocopherol to indicate whether it is natural or synthetic) as listed below: Natural New designation: RRR-alpha-tocopherol (because all 3 positions are RRR) Old designation: d-alpha-tocopherol Synthetic New designation: all-rac-alpha-tocopherol (because it is a racemic mixture) Old designation: dl-alpha-tocopherol The old d and dl designations were describing the chemical structure that are sometimes still used

The soluble fraction was separated from debris by spinning down at 20,000 g for 20 min