The CatSper protein plays a crucial role in sperm function.

I hired two catsitters to take care of my cats while I was on vacation.

I hired a catsitter to take care of my cats while I was on vacation.

She catsits for her neighbor every weekend.

I am catsitting for my neighbor this weekend.

I catsit my neighbor's cat when they go on vacation.

Catsharks are small sharks that belong to the family Scyliorhinidae.

The catshark is a small species of shark found in the family Scyliorhinidae.

I have several catscratches on my arm.

I got a catscratch on my arm.