Douglas Steinberg | Jan 18, 1998 | 9 min read
The field is given a boost by a widening of focus at the institutes as well as a report praising a major initiative. During the brief earthly tenure of the species Homo sapiens, the human genome seems to have accumulated just the right amount of variation to suit the purposes of geneticists. Single-nucleotide polymorphisms (SNPs), the DNA bases that vary systematically between subpopulations, are common enough to serve usefully as chromosomal markers but not so common as to make genetic analys