William Mills

Last year, while teaching an introductory biology course, I received a question I could not immediately answer. We were discussing receptor-mediated endocytosis, the process by which cells internalize specific molecules, when a student raised their hand and asked, “Is there such a thing as receptor-mediated exocytosis?” I was stumped. I admitted that I did not know but promised to find out.

I have the same question. That part is discontinued, but I would like to see if it is available at a specialty parts store or at a junk yard or similar source.If it truly is gone for ever, how can it be refurbished? What goes inside?

On December 15, 2025, the Nasdaq Stock Market LLC (Nasdaq) filed a proposal with the Securities and Exchange Commission (SEC) to amend the exchange's rules to allow equity securities and exchange traded products (ETPs) to trade 23 hours a day, five days a week, as early as late-2026.