They are funny to look at, mild and intelligent: that was what we knew about alpacas until 1989. That year, two students discovered by chance one important feature that has long remained unknown. This and other species belonging to camelid family have "miniature" antibodies: smaller than ours and those of most mammals, they can reach even the most difficult targets. Researchers at Boston Children 's Hospital used the so called “nanobodies” to make CAR-T cells better at solid tumors. The study has been published in the journal PNAS.