Goblet Cells Figure (Figure 17.6). Reprinted from OpenStax Microbiology (p. 689), by N. Parker, M. Shneegurt, A.-h. Thi Tu, B. M. Forester, and P. Lister, 2016, Rice University. Copyright 2016 by Rice University. Available at: https://openstax.org/books/microbiology/pages/17-1-physical-defenses