A targeting vector containing the CAG promoter, a floxed STOP cassette followed by a carboxy terminal His-tagged CD9/GFP cassette, and a NeoR selection cassette was inserted into the Gt(ROSA)26Sor locus. CD9/GFP is human CD9 containing a carboxy terminal His-tag and fused to copepod green fluorescent protein (CopGFP or Turbo-GFP from Pontellina plumata). (J:275836)