Fig. 4.

Thymic histology in young (a), old (b), MT-I*(c), young stressed C57BL/6J (d) and stressed MT-I* (e) mice. Young (2 months of age) and old (22 months of age) are C57BL/6J controls (magnitude 10×). The thickness of the thymic cortex (more dark area of thymic cellularity) [measured in various fields of thymic sections by computer assisted image analyser (KS 300, Kontron, USA)], is reported in Table 5. Thymic cortex is absent in old mice (b) and very limited in stressed MT-I* mice (e). Scale bar in white=125 μm.