I bought a new tailor's chalk pen.

I drew a picture with a new felt-tip pen.

My new graphics tablet is very easy to use.

My new marking pen is brightly colored.

My new marker pen has vibrant colors.

I used pentane in a chemistry experiment.

What is his pen name?

Quinoline is an important compound in organic chemistry.

Inflammation of the Bartholin's gland is a common problem in female genitalia.

Proline is one of the components of proteins.