[Expression of HLA-Dr and CD1+ cells in malignant and benign pigmentary tumors]. / Expresión del HLA-Dr y células CD1+ en tumores pigmentarios malignos y benignos.

The authors studied the expression of CD1 and HLA-Dr antigen in benign and malignant melanic tumors to known if were the melanoma's cells or Langerhans cells, presents on the tumor, which exhibited the HLA-Dr antigens, and if the HLA-Dr expression was related to volume, depth and metastatic characteristics. These antigens were studied with the monoclonal antibodies labelled to avidin-biotin-peroxidase system. The results shows than the proportion between the number of Langerhans cells and HLA-Dr positive cells is inverse. No differences were found between the expression of the HLA-Dr antigens and number of Langerhans cells and volume, depth or metastatic characteristics.

[Differentiation of human epidermis cultured in vitro]. / La diferenciación de la epidermis humana cultivada in vitro.

The authors studied human epidermal differentiation in normal skin and skin cultured according to Green's method. No differences was observed except for the filaggrin and involucrin patterns; the lectins revealed identical patterns in normal and cultured human epidermis. The ultrastructural study verified a similar morphology in both types of epidermis.