Covering for a bald spot

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Possible Answers:

SOD.

Last seen on: NY Times Crossword 22 Oct 19, Tuesday

Random information on the term “SOD”:

Superoxide dismutase (SOD, EC 1.15.1.1) is an enzyme that alternately catalyzes the dismutation (or partitioning) of the superoxide (O2−) radical into either ordinary molecular oxygen (O2) or hydrogen peroxide (H2O2). Superoxide is produced as a by-product of oxygen metabolism and, if not regulated, causes many types of cell damage. Hydrogen peroxide is also damaging and is degraded by other enzymes such as catalase. Thus, SOD is an important antioxidant defense in nearly all living cells exposed to oxygen. One exception is Lactobacillus plantarum and related lactobacilli, which use a different mechanism to prevent damage from reactive (O2−).

SODs catalyze the disproportionation of superoxide:

In this way, O2− is converted into two less damaging species.

The pathway by which SOD-catalyzed dismutation of superoxide may be written, for Cu,Zn SOD, with the following reactions :

The general form, applicable to all the different metal-coordinated forms of SOD, can be written as follows:

SOD on Wikipedia