Fig. 2. Four silver staining gels that illustrate the four allelic change patterns over the 115 years of Canadian oat breading. A, Random (from AM3); B, Shifting (from AM42); C, Increasing (from AM102); and D, Decreasing (from AM31). In each gel, samples from 96 Canadian oat cultivars are arrayed from left to right in a chronological order, from 1886 to 2001. The order parallels that in Table 1. Only the last two digits of the release year are given for each cultivar. M is the DNA ladder.