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Central tolerance is essential to proper immune cell functioning because it helps ensure that mature B cells and T cells do not recognize self-antigens as foreign microbes. [2] More specifically, central tolerance is necessary because T cell receptors (TCRs) and B cell receptors (BCRs) are made by cells through random somatic rearrangement. [1]
Louisiana passed a law that will take effect in the 2024–2025 academic year, prohibiting the use and possession of cell phones on school property throughout the school day. If students bring phones to school, they must be turned off and stored away. Exceptions are allowed for students who need accommodations for learning purposes. [95]
School officials were called in to investigate the incident, and referred to the knife as a "deadly weapon." [17] Other cases include a straight-A student who was ordered to attend "reform school" after a classmate dropped a pocket knife in his lap, [18] and in 2007, when a girl was expelled for using a utility knife to cut paper for a project ...
Students make their way into Little Rock Central High School on Monday, Aug. 24, 2020, for the first day of classes in the Little Rock School District. (Tommy Metthe/Arkansas Democrat-Gazette via ...
In biology, cell theory is a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.
In 1989, two scientific groups came up with the hypothesis that the thymus expresses genes which are in the periphery, strictly expressed by specific tissues (e.g.: Insulin produced by β cells of the pancreas) to subsequently present these so-called "tissue-restricted antigens" (TRAs) from almost all parts of the body to developing T cells in order to test which TCRs recognize self-tissues ...
California became the first U.S. state to bar school districts from requiring staff to notify parents of their child’s gender identification change under a law signed Monday by Gov. Gavin Newsom.
The Carroll school board voted Wednesday to authorize a lawsuit challenging the Biden Administration’s “redefinition of sex in Title IX.” The nonprofit Alliance Defending Freedom of ...