here I got some tips to distinguish certain cells in endocrine part microscopically (H&E stain):
1. acidophil (hypophysis)- red colour
2. parafollicular cell (thyroid)- small cell between follicles, hav cytoplasm and nucleus around it.
3. chief cell (parathyroid)- purple colour
4. oxyphil cell (parathyroid)- red colour with cytoplasm
5. centro-acinar cell (pancreas)- look like fried egg shape, between acinus cell.