SMN1 and neoplasm: In line with these observations, the anti-NOS1APc isoform-specific antiserum showed strong expression at cell-cell junctions of CK8+ LECs in normal mammary glands, KANK1-WTPyMT, and KANK1-KOPyMT tumors, however, no expression in SMA+ myoepithelial cells and cells of the tumor stroma (Fig. 6a).