P04823

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

The ED50= 3-10 ng/ml corresponding to a specific activity of 100,000-333,334IU/mg determined by the dose dependent proliferation of murine NFS-60 cells.

Lyophilized from a 1mg/ml solution without any 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 0.171 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 standard solution of IL-3 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 3 in sterile 18MΩ-cm H2O not less than 100ug/ml, which can then be further diluted to other aqueous solutions.

Escherichia Coli.

Lyophilized Interleukin-3 although stable at room temperature for 3 weeks, should be stored desiccated below -18^oC. Upon reconstitution IL3 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.

MCGF (Mast cell growth factor), Multi-CSF, HCGF, P-cell stimulation factor, IL-3, MGC79398, MGC79399.