[neverdem]

"The replacement trachea - the bony tube that connects the nose, mouth and lungs - was stripped of the donor's cells to leave a scaffold which was then laced with the child's stem cells."

They probably soak the donor trachea in a solution of proteases, enzymes that dissolve proteins, to remove any antigens so as not to provoke an attack with antibodies or other elements of the immune system. The scaffold is probably just decellularized hyaline cartilege, IMHO.

[metmom]

Thanks. The article wasn’t very clear about that and I didn’t know that they could do that.