Label-retaining properties are specific to cancer stem cells by using a chemical analog BrdU thymidine (bromodeoxyuridine) based on the principle of their stem cells have a cell or a cell, cancer stem cell types that have a slow (slow proliferation rate) and in peace (quiescent state) to do so, BrdU into. Normal cells have a regular speed. When there is a breakdown of the quantity of the substance will make accurate BrdU in cell decreases, while the cancer stem cells are divided into a slow. When a cell is found to still have high levels of a substance called BrdU in label-retaining cells (LRCs), which can be analyzed by flow cytometry or immunohistochemistry method, however. In this way, there are still problems to be identified and classified the cancer stem cells, extracted from living cells, so the cells also have this life to test stem cells to cancer. That has made it difficult, and requires the design of detection system of genetic (genetic tracking system) where appropriate.
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