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A cell is recognized as "self" or "non-self" by its
HOMO
Highest Occupied Molecular Orbital, the topmost energy level occupied by electrons in a molecule under normal conditions.
Allyl Anion
A negatively charged allyl group (a three-carbon chain with a double bond) that acts as a nucleophile in organic reactions.
LUMO
Lowest Unoccupied Molecular Orbital, which is the lowest energy molecular orbital that is currently unoccupied by electrons and can accept an electron.
Pentadienyl Anion
A negatively charged ion formed by removing a proton from a pentadiene, featuring five carbon atoms connected with alternating single and double bonds.
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