You can use H&E dye

You can use Hematoxylin and Eosin dye.

you can use immunohistochemistry technique, antibodies for certain receptors

Special stain like silver stain

Simple H&E dye can be use for experienced pathologist.

For more accurate result I recommend the use of immunohistochemistry (ihc) stains

Usually we do the neuroendocrine marker stains such as chromogranin A

Thank you very much for your great answer.

I also use immunohistochemistry stain to detect for insulin and glucocan in deferent animals

Your welcome

Immunohistochemistry stain helps a lot for more accurate detection of certain cell

Good luck on your research!

Thank you