 One-fourth of the options vest in June 2021, and the balance of the options vest in a series of thirty-six successive equal monthly installments thereafter and was granted pursuant to the Calithera Biosciences, Inc. 2018 Inducement Plan, or Inducement Plan, which was approved by Calitheras board of directors in January 2018 in accordance with Nasdaq Listing Rule 5653c4. The stock options also have a ten year term and are subject to the terms and conditions of the Inducement Plan and the stock option agreement pursuant to which the options were granted. 