The sequence of the first five N-terminal amino acids was determined and was found to be Met-Ser-Ile-Lys-Ser.

The ED50 as determined by the dose-dependant stimulation of MC/9 cell which was found to be < 15ng/ml corresponding to a Specific Activity of 66,667IU/mg.

The protein was lyophilized with no additives.

Sterile Filtered White lyophilized (freeze-dried) powder.

Protein quantitation was carried out by two independent methods
1. UV spectroscopy at 280 nm using the absorbency value of 0.36 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics).

2. Analysis by RP-HPLC, using a calibrated solution of IL-10 as a Reference Standard.

Greater than 95.0% as determined by(a) Analysis by RP-HPLC.
(b) Analysis by SDS-PAGE.

It is recommended to reconstitute the lyophilized Interleukin 10 in sterile 18MΩ-cm H2O not less than 100ug/ml, which can then be further diluted to other aqueous solutions.

Escherichia Coli.

Lyophilized Interleukin-10 although stable at room temperature for 3 weeks, should be stored desiccated below -18^oC. Upon reconstitution IL10 should be stored at 4^oC between 2-7 days and for future use below -18^oC.
For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA).
Please avoid multiple freeze-thaw cycles.

B-TCGF, CSIF, TGIF, IL-10, IL10A, MGC126450, MGC126451, Cytokine synthesis inhibitory factor.