KhomichV. Т., N. V. Dyshliuk, T. A. Mazurkevych, GuralskаS. V., and UsenkoS. І. 2021. “Content and Location of Lymphocyte Subpopulations With Markers CD4+, CD8+ and CD20+ in the Esophageal Tonsil of Chickens and the Meckel Diverticulum of Ducks ”. Regulatory Mechanisms in Biosystems 12 (3), 396-402. https://doi.org/10.15421/022154.