dissolving streptavidin

[M.fennema at chem.rug.nl.nospam]

Hello,

I've received some streptavidin (1 mg), in 
what solution should I dissolve this to make a working 
solution of about 1 mg/ml?

(e.g. tris-buffer or tridest, or phosphate buffer, and what about
adding glycerol for storage at -20 degrees?)

Thanks in advance,

Marko