Gate neurons inhibit pain using substances called -epinephrine
-serotonin
-nucleopeptides
-endorphins

Endorphins.

Explanation:

Endorphins are a substance produced by the pituitary gland, whose function is to stabilize the feelings of well-being of the body when performing certain activities, such as those that include physical effort, or even when experiencing pain sensation, where endorphins work as analgesics that slow down the sensation of pain.

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beware of counterfeit parts

some counterfeit and third party power adapters and batteries may not be designed properly and could result in safety issues. to ensure you receive a genuine apple battery during a battery replacement, we recommend visiting an apple store or apple authorized service provider. if you need a replacement adapter to charge your apple device, we recommend getting an apple power adapter.

also non-genuine replacement displays may have compromised visual quality and may fail to work correctly. apple-certified screen repairs are performed by trusted experts who use genuine apple parts.