[Why and how to examine the newborns' hips?].

The authors insist on the importance of a careful clinical examination of newborn's hips, and on the necessity of an early diagnosis of congenital hip dislocation, in order to optimize the probability of therapeutic success. They don't consider hip dislocations resulting from neuromuscular diseases or from complex malformations (e.g.

Microcephaly, macrotia, unusual mimics and mental retardation syndrome: new syndrome or variant of De Lange type 2 syndrome.

We report a boy who shows a severe microcephaly, with mild mental retardation and hypotonia, and a dysmorphic facies: (flat profile, arched eyebrows, mild ptosis, short nose with raised basis, large tip and anteverted nares, long, smooth philtrum, narrow mouth with down turned corners, very large, backward tilted ears, with a prominent lobule, retrognathism and very small and widely spaced, although normally shaped teeth. Vesicoureteral reflux was present. The mother showed similar aspect, large ears, and a grinning smile.

Intercellular contacts between germinal center cells. Mechanisms of adhesion between lymphoid cells and follicular dendritic cells.

Intercellular connections exist between germinal center cells especially between lymphoid cells and follicular dendritic cells (FDC). Even after isolation, FDC remain associated to lymphocytes and are able, in a cell suspension, to establish new connections with others. Using human tonsillar cells or mouse lymph node cells we analysed these connections which were shown to be species-specific.