a, Array-CGH plots showing conserved deletion of PTEN in both mouse TKO and human T-ALL cell lines; PTEN indicated in green. The y axis shows, log2 ratio of copy number (normal, log2 = 0); amplifications are above and deletions are below the red axis. b, Western blotting for PTEN, phospho-Akt, Akt and tubulin (loading control) in a panel of murine TKO and human T-ALL cell lines. BE13 and PEER are synonymous lines. Samples in red harbour confirmed sequence mutations; samples in blue harbour aCGH-detected deletions. c, CNAs affecting other members of the Pten-Akt axis are shown as log2 ratio plots for murine TKO tumours. The location of each gene (Akt1/Tsc1) is shown in green.