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Body weight changes with repeated oral administration of two particle sizes of polypropylene (PP) microplastics for 4 weeks. Body weight changes were measured once a week. (a,b) Body weight changes of males and females in approximately 5 µm particle size of PP microplastics. (c,d) Body weight changes of males and females in 10–50 µm size of PP microplastics. Data are presented as mean ± standard deviation.
