The thymic microenvironment constitutes a unique cell environment composed of thymic epithelial cells, myoid cells, and bone marrow-derived accessory cells for the differentiation, maturation and selection of T lymphocytes. The histological feature of thymus is markedly dependent on the age of individual and on various negative stimuli. Our study group consisted of fourteen newborns whose thymu...

The Sertoli cells are critical regulators of testis differentiation and development. In the adult, however, their known function is restricted largely to maintenance of spermatogenesis. To determine whether the Sertoli cells regulate other aspects of adult testis biology we have used a novel transgenic mouse model in which Amh-Cre induces expression of the receptor for Diphtheria toxin (iDTR) s...

Let (K; +, ·,′ , 0, 1) be a differentially closed field. In this paper we explore the connection between Ax-Schanuel type theorems (predimension inequalities) for a differential equation E(x, y) and the geometry of the set U := {y : E(t, y)∧ y′ 6= 0} where t is an element with t′ = 1. We show that certain types of predimension inequalities imply strong minimality and geometric triviality of U ....

Consider a set S ⊂ Z. Suppose that, for many primes p, the distribution of S in congruence classes mod p is far from uniform. How sparse is S forced to be thereby? A clear dichotomy appears: it seems that S must either be very small or possess much algebraic structure. We show that, if S ⊂ Z ∩ [0, N ] occupies few congruence classes mod p for many p, then either S has fewer than N elements or m...

6. Mentzel T, Kutzner, K. Hobnail hemangioma (“targetoid hemosiderotic haemangioma”): Clinicopathologic and immunohistochemical analysis of 62 cases. J Cutan Pathol (submitted). 7. Calonje E, Fletcher CDM, Wilson-Jones E et al. Retiform hemangioendothelioma. A distinctive form oflow-grade angiosarcoma delineated in a series of 15 cases. Am J Surg Pathol 1994; 18:115-125. 8. Santonja C, Torrelo ...

Myopericytoma is a rare benign tumor with perivascular myoid differentiation. It shares histomorpholoic features with the so-called hemangiopericytoma, myofibroma and glomus tumor. We hereby report the case of a 14-year-old boy who presented with a slowly growing, painless, firm mass on upper lip, diagnosed as myopericytoma on the basis of histopathology and immunohistochemistry. To the best of...