Returns the rs-ids for the chip object, e.g, "rs689", etc
Only if these are annotated internally, or else a vector of NAs
Usage
rs.id(x, b = TRUE)
"rs.id"(x, b = TRUE)
Arguments
x
a ChipInfo object
b
logical, whether to show 'b' suffixes on rs.ids which
are created in the background to allow duplicate ids to be uniquely
represented for lookup and reference purposes.