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Animal randomization is the process of randomly assigning animals to treatment groups in an experiment. This is done to ensure that the groups are as similar as possible, and to reduce the risk of bias. There are a number of different methods that can be used for animal randomization, including: Simple randomization: This is the most basic method, and involves randomly assigning animals to groups without any regard for any other factors. Block randomization: This method involves dividing the animals into groups based on a certain factor, such as age or sex, and then randomly assigning animals from each group to treatment groups. This helps to ensure that the groups are more similar in terms of these factors. Stratified randomization: This method is similar to block randomization, but instead of dividing the animals into groups based on a single factor, they are divided into groups based on multiple factors. This helps to ensure that the groups are even more similar. The best method for...

Isolating particular cells from a living creature and then growing those cells in a laboratory using artificial medium is the procedure that is known as cell culture. Before being cultivated, the cells can either be extracted from the tissue and further processed using additional enzymatic or mechanical means, or they can be derived from an already established cell line or cell strain.  Isolating the cells from the tissue and processing them further before cultivation are both viable options. Primary culture is the stage of culture that happens when tissue-isolated cells have multiplied under ideal conditions to fill all available substrate. This stage of culture is referred to by the name "primary culture" (i.e., reached confluence). It is important at this stage to subculture (also known as "passaging") the cells into a new vessel with fresh growth medium. This gives for additional space for the cells to continue expanding and is necessary. Protecting Cell Culture...