precipitating nucleotide protocol

[Sean Rollins]

 I'm trying to synthesize 4 thio UTP and I'm losing my sample at the 
precipitation step.  The protocol I have contains 20mM ATP and 10mM
4 thio UDP in 100ul and the phosphate is transfered.  This is brought up to 
500ul with 300mM sodium acetate and 0.1% SDS and precipitated with an equal 
volume of 1:1 ethanol/acetone.  I've checked my reaction by HPLC and I'm 
losing my sample at the precipitation step.  No details are given on this 
precipitation step (time, temp and spin conditions).  If anyone has any advice 
or any 4 thio UTP for a possitive control it would be appreciated.
                                Thank you 
                                Sean Rollins
		Rollins.24 at osu.edu