Muscles contain transaminases which transfer the amino group from amino acids to pyruvate, yielding alanine and a α-ketoacid similar to the original amino acid. The α-ketoacid is further metabolized, yielding ATP. Alanine is transported though the bloodstream, where it is transaminated to pyruvate, which is converted through gluconeogenesis into glucose. The amino group released from alanine is taken up by α-ketoglutarate, converting it to glutamate. NH4+ is removed from glutamate by glutamate dehydrogenase, and incorporated in urea, which is excreted in urine.