Mitochondrial research expanded in the late twentieth century after the invention of the electron microscope, and with the development of molecular genetic techniques, such as DNA sequencing and the use of enzymes that cut DNA at certain sites, called restriction endonuclease enzymes.ithin each mitochondrion is the mitochondrial DNA (mtDNA), which is different from the DNA in the cell's nucleus (nDNA). Organisms inherit their mitochondria only from their mothers via egg cells (oocytes).
Splenomegaly is a term which refers to enlargement of the spleen. The normal adult splenic length upper limit is usually around 12-15 cm.he causes of splenomegaly are protean, and can be thought of under a number of headings: 1  haematological disease. 2  haemodynamic. 3  infectious. 4  storage diseases/metabolic diseases. 5  neoplastic (non-haematologic).
URL of this page: //medlineplus.gov/ency/article/003276.htm. Splenomegaly is a larger-than-normal spleen. The spleen is an organ in the upper left part of the belly. The spleen is an organ that is a part of the lymph system. The spleen filters the blood and maintains healthy red and white blood cells and platelets. Many health conditions can affect the spleen.