The first TEs were discovered in maize (Zea mays), by Barbara McClintock in 1948, for which she was awarded a Nobel Prize in 1983. She noticed insertions, deletions, and translocations, caused by these elements. These changes in the genome could, for example, lead to a change in the color of corn kernels. About 85% of the genome of maize consists in TEs.[6] The Ac/Ds system described by McClintock are class II TEs. ransposons in bacteria usually carry an additional gene for function other than transposition---often for antibiotic resistance. The most common form of transposon in humans is the Alu sequence. It is approximately 300 bases long