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Figure 1: Trypan blue positive and negative primitive stem cells from adult
equine blood prior to ingestion of AFA, original magnification, 200x. Pluripotent stem cells (white arrows), negatively stained for Trypan blue. Cells have machinery to pump out Trypan blue dye and are thus negatively stained. Totipotent stem cells (black arrows), positively stained for Trypan blue. Cells lack machinery to pump out Trypan blue dye and are thus positively stained. |