text: This organism is the subject of a long-term experiment run by Richard Lenski since 1988.
full_question: This organism is the subject of a long-term experiment run by Richard Lenski since 1988. Shiga-like toxin is produced in strains of this organism that cause hemolytic-uremic syndrome. Commonly studied strains of this organism include the B and K-12 strains. Edward Tatum and Joshua Lederberg used this organism to describe the exchange of genetic material via conjugation. To demonstrate the spontaneity of genetic mutations, Luria and Delbruck infected this organism with bacteriophages. The lac operon was discovered in this rod-shaped Gram-negative bacteria. For 10 points, name this model organism, a bacteria which is found in the human gut.
first_sentence: This organism is the subject of a long-term experiment run by Richard Lenski since 1988.
raw_answer: E. coli [or Escherichia coli]