[Reaction of the testicles of old animals on administration of human fetal tissues].

The aim of the work was to study the effect of fetal tissues on histological structure of testicles of the old mice. The data obtained suggest that the implantation of human fetal tissues postponed age degeneration of tissues.

Specific features of the immune response in old recipient mice to cell therapy.

Implantation of somatic cells from autopsy specimens (15-18 weeks gestation) had a modulatory effect on immunogenesis in old mice. Activation of the immune system in recipient animals after administration of somatic cells reflects a multistage influence of test preparation. The observed changes were reversible.

[Histophysiology of lymphocyte-tissue complexes in human fetal intestine].

Using histochemical and immunological methods, the development of lymphocyte-tissue complexes in the distal part of human fetal intestine (appendix, Peyer's patch) was studied in relation to the changes taking place in the ileocecal lymph nodes. It was found that this autonomous gut immune system started to function in the second trimester of fetal development. It is dominated by T-cell system of the immunity.

[Immunomorphological lymphocytic-tissue associations in the anterior gastrointestinal tract in human fetus].

Prevalence of T-cell system of the immunity is found in the pharyngeal, lingual and palatine tonsils and lymph nodes. B-lymphocytes are much less numerous. Adenocytes consolidation in the structure of "pharyngeal hypophysis" is considered as additional part of the anterior hypophysis.

[The order of lymphatic organs involvement in developing immune system of human fetus and its significance in perinatal pathology].

The liver, thymus, spleen, lymph nodes, palatine and pharyngeal tonsils, appendix and Peyer's patch were studied by morphological and immune methods in more than 100 human embryos of 3 to 34 weeks of development. The order of some organs development in the immune system is established. Key periods in the development of the thymus (5-12 weeks) and 18 weeks when peripheral organs enter the immune system are specified.