Boxplots. Example of a boxplot illustrating the spread of a gene's expression values across three classes of leukemia samples: Acute Lymphoblastic Leukemia (ALL), Acute Myeloid Leukemia (AML) and Mixed Lineage Leukemia (MLL) (data set by Armstrong et al. , [see Additional file 1 for further details on this and other differentially expressed genes]).
Glaab et al. BMC Bioinformatics 2009 10:358 doi:10.1186/1471-2105-10-358