Complementation and allelism analyses. The grid shows all pairwise comparisons of Rw-region lethal mutations for potential allelism. Original mutations located distal to Rw are not included, nor is L5Jcs17, which went extinct before mapping and allelism testing could be completed. Actual complementation tests were, in most cases, only performed when mutations co-mapped to overlapping genetic intervals (dark green or red). The majority of mutations were mapped to sufficient resolution to indirectly conclude they are not allelic (light green).