Class "upstreamSeqs" collects DNAstrings upstream of genes
environment-based storage of upstream sequences
Objects from the Class
Objects can be created by calls of the form
These are collections of (possibly large) environments
describing upstream sequences of a genome.
if (!exists("sceUpstream")) data(sceUpstream) keys(sceUpstream)[1:5] getUpstream("YAL001C", sceUpstream)