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. 2013 Jun 11;89(6):201–225. doi: 10.2183/pjab.89.201

Figure 6.

Figure 6.

Pathways of activation of pepsinogen to pepsin. PG, pepsinogen; PG*, pepsinogen, intermediate or pepsin; P, pepsin; and I, activation intermediate. Two-step activation is shown as an example for multiple-step activation.