Answer
a. MHC-II proteins.
Work Step by Step
A helper T cell can only bind to another cell that has MHC-II proteins.
A cytotoxic T cell can only bind to MHC-I proteins.
Anatomy & Physiology: The Unity of Form and Function, 7th Edition
by Saladin, Kenneth
Published by
McGraw-Hill Education
ISBN 10:
0073403717
ISBN 13:
978-0-07340-371-7
Chapter 21 - The Lymphatic and Immune Systems - Study Guide - Testing Your Recall - Page 846: 9
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