i use 5ug/ml for the final stimulation. , B2 w5 b3 e+ H! Astock is 5mg/ul in water and then passing though 22um membrane.3 g: c$ d, c& P, n1 k$ n
keep the stock solution at 4 degree, and i think 3 month should be no problem. h6 {7 M+ {& \keep the powder also at 4 degree.