Progenitor cellA progenitor cell is a biological cell that can differentiate into a specific cell type. Stem cells and progenitor cells have this ability in common. However, stem cells are less specified than progenitor cells. Progenitor cells can only differentiate into their "target" cell type. The most important difference between stem cells and progenitor cells is that stem cells can replicate indefinitely, whereas progenitor cells can divide only a limited number of times. Controversy about the exact definition remains and the concept is still evolving.
Composite data typeIn computer science, a composite data type or compound data type is any data type which can be constructed in a program using the programming language's primitive data types and other composite types. It is sometimes called a structure or aggregate type, although the latter term may also refer to arrays, lists, etc. The act of constructing a composite type is known as composition. Composite data types are often contrasted with scalar variables. A struct is C's and C++'s notion of a composite type, a datatype that composes a fixed set of labeled fields or members.
Invasion périneuraleL'invasion périneurale est un mode d'extension loco-régionale des cellules cancéreuses le long d'un nerf au cours de l'extension tumorale. Elle s'observe en particulier fréquemment dans les cancers de la prostate (adénocarcinome prostatique) et les différents types de cancers ORL. Fichier:Prostatic adenocarcinoma with perineural invasion.JPG|Invasion périneurale par un adénocarcinome prostatique. HE, x200 Fichier:Perineural invasion prostate high mag.jpg|Invasion périneurale par un adénocarcinome prostatique.
Adénocarcinome pulmonaireL'adénocarcinome pulmonaire est une tumeur maligne de différenciation glandulaire localisée au poumon. L'adénocarcinome pulmonaire est responsable de 29,4 % des cancers du poumon. Il a généralement son origine dans le tissu pulmonaire périphérique. La plupart des cas d'adénocarcinome sont associés au tabagisme ; cependant, parmi les personnes qui n'ont jamais fumé (« jamais-fumeurs »), l'adénocarcinome est la forme la plus fréquente de cancer du poumon.