Ribosome:
I'm always making things for my friends
I'm the only protein you need (because they make proteins)
I might not be a nucleus, but at least I actually work for my living (the nucleus instructs the ribosomes to do the work)
I was into codons before everyone started reading them
You need me to survive (ribosomes are an organelle shared by all kinds of cells)
Rough ER is forever alone without me
