The phrase is based on the scientific phenomenon of antagonistic pleiotropy, where a gene variant that is beneficial in one context (like surviving the Black Death) can have harmful effects in another (like increasing the risk of autoimmune disease). For example, a specific version of the ERAP2 gene helped some individuals survive the Black Death, but it is now linked to an increased risk of conditions like Crohn's disease. This means that a genetic advantage your ancestors needed to survive was passed down, but it now contributes to a modern health problem.

This t-shirt is everything you've dreamed of and more. It feels soft and lightweight, with the right amount of stretch. It's comfortable and flattering for all.

• 100% combed and ring-spun cotton (Heather colors contain polyester)
• Fabric weight: 4.2 oz./yd.² (142 g/m²)
• Pre-shrunk fabric
• Side-seamed construction
• Shoulder-to-shoulder taping
• Blank product sourced from Nicaragua, Mexico, Honduras, or the US

This product is made especially for you as soon as you place an order, which is why it takes us a bit longer to deliver it to you. Making products on demand instead of in bulk helps reduce overproduction, so thank you for making thoughtful purchasing decisions!