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ACNE
A disease of the pilo-sebaceous follicle, which appears at the onset of puberty.

ALLERGEN
Said of a substance which causes an allergy.

ANDROGEN (male hormones)
All chemical substances whose actions are similar to those of testosterone.

 
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BACTERIUM
Unicellular micro-organisms characterised by a plasmic membrane, lined with a rigid wall of a lipidic, proteinic and polysacchardic nature. Its nucleus, devoid of a membrane, has only one chromosome, comprised of one DNA molecule, folded over on itself. Bacteria reproduce by splitting. There are several types of bacteria but the two principal ones are microbes - rounded in shape - and bacilli -shaped like small rods.
 
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CARBOHYDRATE
Component of living matter.

CELL
A functioning structural unit, essential to all living organisms.

COLLAGEN
A fibrous protein made up of large tropocollagen molecules, synthesized in fibroblasts, each of which has three large peptidic chains rolled up in the shape of a helix, together forming a large helix.

 
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DERMIS
A connecting tissue in vertebrates, which nourishes the skin and is situated between the epidermis and the hypodermis.

DNA
A nucleic acid which stores and transmits genetic information. It is composed of two chains - a double helix - of subunits of nucleoids containing deoxribose sugar.