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“Similarly, the protective effect of total carotene (highest quartile OR 0.3, CI 0.1-0.6) was somewhat greater than that of beta-carotene alone (highest quartile OR 0.4, CI 0.2-0.8).”
“However, administration of beta-carotene raised plasma carotene concentrations relative to controls when injected during proestrus/estrus (P = 0.0096) and diestrus (P = 0.0099).”