Thymalin in developing respiratory organs of human fetus

Plain-language summary

Paraphrased from the published abstract below — not a verdict on whether anything works.

In this study of human fetal tissue, the authors examined the appearance of the immunomodulator thymalin in respiratory organs during early embryogenesis. They report that thymalin accumulated in young cells of the airway epithelium and that thymalin-positive cells were diffusely distributed in the alveolar region. Mature T cells (CD3+) and CD4+ and CD8+ cells were detected in the lungs during the same period despite the absence of a thymic microenvironment. The authors describe the forming immune elements as providing local protection of the fetus, and present the findings descriptively without quantitative measurements.