Apicoplasts are organelles that were discovered in parasites like the one that causes malaria. How did scientists discover these organelles, and what do they do?

Additionally, signaling nodes at the lysosome (another organelle), such as Folliculin (Flcn), Ragulator and Rag GTPases, ...

The peripheral endoplasmic reticulum (ER) forms a continuous, dynamic network of tubules that plays an important role in protein transport and quality control, cellular signaling, and stress response.