To visualize the tumor-localization of SLT-1AIYSNKLM, a group of 518-A2 xenograft-bearing SCID mice received a single i.v. injection of either 125I-SLT-1AIYSNKLM (900 μCi) or wt 125I-SLT-1A (900 μCi; negative control). Here, GDI1 is linked to neoplasm.