SLCO1B3 and spindle cell hemangioma: Bortezomib treatment did not affect the total protein levels of OATP1B1 and OATP1B3 in human SCH (Fig 3A) or in HEK293 stable cell lines expressing untagged OATP1B1 and OATP1B3 (S2A–S2D Fig).