How many instances of "p" are there in:

Stimulation of tumor necrosis factor receptor 1 (TNFR1) can initiate several cellular responses, including apoptosis, which relies on caspases, necrotic cell death, which depends on receptor-interacting protein kinase 1 (RIP1), and NF---
B activation, apoptosis, and nonapoptotic death signals through separate and competing signaling pathways.
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There are seventeen "p"s.
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