Starting from microarray data, I retrieved the same positions in other populations from the 1000 genomes. In few cases I've found that for the same locus there are two different rs IDs or more.
Sometimes they are simply separated by a semicolon:
19 123 rs123; rs432
Other times they are reported as two different sites with different rs IDs:
19 123 rs879 19 123 rs123; rs432
How can I deal with them? And what does this multiple rs codes for a locus mean?