Fig. 1

The types of array platforms used by participants evolved with changing laboratory practices through the course of the proficiency testing period. The x-axis shows the individual mailing for each Survey year (A = first and B = second) and N = the number of participants subscribed to the respective Survey. The y-axis shows the percentage of those laboratories using respective array platforms. Light gray lines represent bacterial artificial chromosome platforms, black lines represent oligonucleotide platforms, and gray lines represent SNP platforms.