Castle Biosciences Inc. deepened the moat around its position in melanoma diagnostics with the acquisition of Myriad Mypath LLC from Myriad Genetics Inc. The acquisition gives Castle (NASDAQ:CSTL) the Myriad Mypath Laboratory in Salt Lake City where the Mypath Melanoma 23-gene expression profile (GEP) test is owned and offered. Mypath Melanoma joins Castle's Decisiondx Diffdx-Melanoma, enabling Castle to provide comprehensive molecular testing for difficult-to-diagnose melanocytic lesions.