how to recognise the diferent units of rDNA? more easily RNA structure drawing - help! (Mar/12/2007 )

hi, everyone, here are two question, somebody help me!

thanks!

1:
I have gotten a some rDNA-LSU sequences of fungi, how can I recognise the diferent coden regions, such as ITS1, ITS2, 5.8SrDNA, and other region? or what is the sequence characters of the begining and ending of those DNA region?

2:
I have drawn the secondary structure of 5.8SrDNA using RANstructure 4.3, however, compared with the standard structure of 5.8S rDNA of yeast, my results is very very difenent.
Why?
How can I get a relative reasonable seconary structure of rDNA, and Which soft could help me do this work easily?