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  ______     ___      _____    __   __    ______  
 /_____//   / _ \\   /  ___||  \ \\/ //  /_   _// 
 `____ `   | / \ || | // __     \ ` //   `-| |,-  
 /___//    | \_/ || | \\_\ ||    | ||      | ||   
 `__ `      \___//   \____//     |_||      |_||   
 /_//       `---`     `---`      `-`'      `-`'   
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Text this: How the immune system recognizes self and nonself : immunoreceptors and their signaling