Malus sieversii modern apple cultivars. Unlike domesticated varieties its leaves go red in autumn: 62.2% of the trees in the wild do this compared to only 2.8% of the regular apple plant or the 2,170 English cultivated varieties. The species is now considered vulnerable to extinction. "Malus sieversii" has previously been identified as the main contributor to the genome of the cultivated apple ("Malus pumila"), on the basis of morphological, molecular, and historical evidence. A DNA analysis in 2010 confirmed "M. sieversii" as the progenitor of the cultivated apple. A third species that has been thought to have made contributions to the
Karl Malus the Mexican border. The experiments he performed on them turned them into animal hybrids. When Captain America tracked his operations down, Karl Malus used his symbiotic abilities to subdue Captain America and experiment on him which turned Captain America into a werewolf. Using Redwing's DNA, Karl Malus turned a Mexican teenager named Joaquin Torres into a bird/human hybrid. Upon being liberated by Misty Knight, Captain America followed and subdued Karl Malus by using Redwing's high-pitched sounds on him and remanded him to S.H.I.E.L.D. custody. While Captain America and the others that were experimented upon by Karl Malus were restored to