as being on the - strand - and I think that is documented, did you look at the documentation? I have: whether a given probe id can be mapped to a single or multiple chromosomal locations. + and - signs are used to indicate the the strand of the chromosome. The names give the chromosome number of concern. NA is assigned to probe identifiers that can not be mapped to any chromosomal location data at this time. Mappings are obtained using data from LocusLink On Fri, Oct 31, 2003 at 11:14:12PM +0100, Johannes H?sing wrote: > Hi all, > if I understand correctly, the locations as in the affychipidCHRLOC > environments are given as chromosome number and base pair. How do I > interpret negative values in the slot? > > Greetings > > > Johannes > -- > Johannes H?sing There is something fascinating about science. One gets > hannes@ruhrau.de such wholesale returns of conjecture from such a > trifling investment of fact. Mark Twain > > _______________________________________________ > Bioconductor mailing list > Bioconductor@stat.math.ethz.ch > https://www.stat.math.ethz.ch/mailman/listinfo/bioconductor -- +--------------------------------------------------------------------- ------+ | Robert Gentleman phone : (617) 632-5250 | | Associate Professor fax: (617) 632-2444 | | Department of Biostatistics office: M1B20 | | Harvard School of Public Health email: rgentlem@jimmy.harvard.edu | +--------------------------------------------------------------------- ------+