Histo is defined as living body tissue.

An example of a histogram as a prefix is ​​the term histology, which means research on biological tissues.

American Heritage English Dictionary is the fifth edition of the English Heritage Dictionary edited by the American Heritage Dictionary. Copyright © 2011, by Houghton Mifflin Harcourt Publishing House in 2016. Houghton Published by Mifflin Harcourt Publishing Company. Copyright

Human body fluids, cells, tissues or organs isolated from xenografts, animals to humans (defined as living cells, tissues or organs of animal origin) and these living heterologous materials, It may constitute an alternative to materials of human origin. And it compensates for the shortage of transplanted human body material. Xenografts are the subject of research and clinical trials. However, xenotransplantation in some countries is a traditional and non-evident therapy that is not regulated. International cooperation and coordination are necessary to prevent and monitor infections caused by xenotransplantation.

Xenografts are treated with any treatment including transplantation, transplantation or infusion of (a) living cells, tissues or organs from a non-human animal source, or (b) human recipients of human body fluids, cells, tissues or organs . Contact with non-human animal cells, tissues or organs living in vitro. Part of the development of xenotransplantation is due to the fact that the demand of human organs in clinical transplantation far exceeds supply. Currently, ten patients in the US die every day from waiting lists to receive important organ transplants for life-saving. Furthermore, recent evidence suggests that cell and tissue transplantation may have a therapeutic effect on specific diseases such as neurodegenerative diseases and diabetes, where body materials are often not commonly used .

Permanent tissue can be defined as a group of living or dead cells formed by dividing tissue, losing its ability to divide and being permanently placed in a fixed position within the body of the plant. Cosmetic tissue with a specific role loses its ability to divide. This process of presenting permanent shape, size and function is called cell differentiation. Cells of meristematic cells differentiate into different types of permanent tissue. There are three types of permanent organization.