Types of Quarks That Make Up Protons, Neutrons

This page is the CodyCross answer for the clue below from Past and Present Tech, Group 1445, Puzzle 2 (Typewriter).

Question is: Types of Quarks That Make Up Protons, Neutrons

and the answer is: UPANDDOWN

Word Meaning:

UP AND DOWN — Upward and downward, alternately.

Definitions from Wiktionary.

Types Of Quarks That Make Up Protons, Neutrons - Past and Present Tech CodyCross Answers | CodyCross Solutions