Regarding a dog with lymphoma (presumably) localized to the spleen:
Oncologist: "Okay, we're gonna get a splenic aspirate and send it out for flow cytometry with the blood. We just read a paper on how they're looking at markers to identify T-zone lymphoma via flow."
Alacrity: "Yeah - CD45, man! Good stuff!"
Oncologist: "CD45 is the shit! Wait, I probably shouldn't say that in front of the students. CD45 is the feces!"