Characterization of FISH deletions by metaphase cytogenetics. Samples that had been characterized by FISH as del6q21, del11q22.3, del13q14, or del17p13 were analyzed by conventional cytogenetics for the extent of deletion. Metaphase chromosomes 6, 11, 13, and 17 are shown schematically with the respective deletions indicated as a red line on the left of each chromosome. Each red line represents a single deletion. Due to space limitations, the numbers of some frequently occurring deletions on chromosome 13 are combined.