Repeat-dose toxicity of human umbilical cord mesenchymal stem cells via subcutaneous injection in NOG mice.

Although our experimental results showed a trend of foamy cell aggregation under the pleura of mice in the high-dose group, we cannot conclusively attribute this aggregation to the administration of the test article owing to the lack of a significant difference among the groups, its occurrence in all groups, its mild severity, and its resolution after the recovery period.

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