What type of grain proteins causes a autoinnune response?

Certain proteins found in gluten, specifically gliadin, can trigger an autoimmune response in individuals with celiac disease. In these individuals, the immune system mistakenly attacks the lining of the small intestine in response to gluten consumption. Other grains, such as those containing avenin in oats and secalin in rye, can also provoke similar responses in sensitive individuals. It's important for those with these conditions to avoid gluten-containing grains.