The initialism HLA can stand for:
Biochemistry
- Human leukocyte antigen, a key part of the human immune system, or the paternity test based upon it
- Hyaluronic Acid, an important molecule that plays a role throughout the body's skin and connective tissues.
Computing
Education
- Houston Learning Academy, an alternative summer education program to redeem or gain credits for the completion of a high school diploma in Houston, Texas.
Engineering
Misc
People
Politics
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