This document summarizes key mutations in the PfCRT transmembrane protein that are associated with chloroquine resistance in Plasmodium falciparum. It identifies 10 mutation sites, including K76T, A220S, N326D, I356T, and R371I. These mutations are located in different transmembrane domains and confer different levels of chloroquine resistance when present individually or in combination. Studies have found that the K76T mutation is most strongly associated with clinical resistance while other mutations can modulate the level of resistance.