The kinetics of thymic epithelial cell development was examined in Wistar strain rats between 13th and 21st days of foetal life. The studies were based on immunocytochemical localisation of cytokeratin 16 (CK 16), Ki67 and on ultrastructural observations of thymus development. Expression of CK16 in individual groups was evaluated using the Micro Image v.4.0 software. In order to monitor changes in CK16 expression in individual days of foetal life, their results were subjected to statistical analysis, demonstrating: (1) correlation between CK16 expression and duration of foetal life, (2) most pronounced CK16 expression on the 16th day of foetal life, (3) typical localisation of CK16-positive cells in individual days of foetal life. The morphological observations suggest that individual subpopulations of epithelial cells differ in their kinetics of proliferative activity.
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