Microscopic analysis of surface staining of sialoadhesin (Sn) on CHO cells. Monoclonal antibodies (mAbs) were added to fixed Sn+ CHO cells to analyze the recognition of surface Sn. Secondary Alexa Fluor 488-labeled antibodies were added to bind with the mAbs (green), nuclei were stained with 4′,6-diamidino-2-phenylindole (DAPI) (blue). Wild-type CHO cells were used as control cells. (A) All anti-hSn mAbs were tested against hSn+-CHO and pSn+-CHO; (B) anti-mSn mAbs were used to stain mSn+-CHO; (C) reference mAbs 7D2, 3D6, and 41D3 were analyzed for recognition of hSn+-, pSn+-, and mSn+-CHO cells, respectively.