In a covalent bond, electrons are shared between atoms. In an ionic bond, electrons are transferred between atoms.

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#Section 2: General Biology

In a covalent bond, electrons are shared between atoms. In an ionic bond, electrons are transferred between atoms.

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#Section 2: General Biology

A given MHC molecule can bind numerous different peptides, and some peptides can bind to several different MHC molecules. Because of this MHC molecule is often referred to as “promiscuous”.

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#Section 2: General Biology

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#Section 2: General Biology

MHC-Peptide Interaction

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#Section 2: General Biology

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#Section 2: General Biology

One individual, however, expresses only a small number of these molecules—up to six different class I molecules and 12 or more different class II molecules.

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#Section 2: General Biology

MHC molecules in mouse