Tizard, I.R. 2023. Chapter 21 – The perissodactyls: horses and their relatives. In: Comparative mammalian immunology: the evolution and diversity of the immune systems of mammals. pp. 329-340. doi.org/10.1016/B978-0-323-95219-4.00007-1 { copied = true; setTimeout(() => copied = false, 10000); }).catch(err => { console.error('Failed to copy:', err); }); " type="button" :class="copied ? 'bg-secondary border-secondary' : 'border-primary hover:bg-primary'" class="group lg:min-w-64 flex items-center justify-between gap-5 border border-solid px-5 py-2 cursor-pointer transition-colors"> PDF download available