I wish to build a chromLocation object and display it with geneplotter. However, I am not interested in gene locations. Instead, I want to examine the density and distribution of SNPs across a chromosome. So I begin with simple chromosomal locations for many SNPs. I found some documentation; 'How to Assemble a chromLocation Object' seemed especially promising. But it turns out that this is specialized on buiding a chromLocation object from a data package (in this case, hu6800.db). Can I get some guidance on building a chromLocation object from scratch, starting with just a set of SNP coordinates? Thanks, - Paul