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Based on limited metadata, the FDA issued a warning letter to Kyowa Hakko Bio Co., Ltd., a company involved in biological product manufacturing, on August 10, 2018. Without access to the full warning letter text or specific subject line details, the precise nature of the violations cannot be definitively determined from the available information. The letter was issued under FDA regulatory authority, though the specific issuing office is not identified in the metadata provided. Additional documentation would be needed to understand the specific compliance concerns and remedial actions required.