Published December 20, 2018 at 2550 × 3263 in Now Available! First Aid for the USMLE Step 1, 2019 Edition Submit an erratum for the First Aid for the USMLE Step 1 book Related ‹ Return to post 2 replies » Under the section of Biochemistry > Amino Acids > Essential, it is written that PVT TIM HaLL is the mnemonic for the essential amino acids. However, Tyrosine is not an essential amino acid. This should be replaced with Tryptophan, which is essential. LikeLike Reply Thanks Palak. We encourage you to submit this correction so that you can receive proper credit: https://www2.usmle-rx.com/2019-first-aid-usmle-step-1 LikeLike Reply Leave a Comment Cancel reply Enter your comment here... Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account. ( Log Out / Change ) You are commenting using your Google+ account. ( Log Out / Change ) You are commenting using your Twitter account. ( Log Out / Change ) You are commenting using your Facebook account. ( Log Out / Change ) Cancel Connecting to %s Notify me of new comments via email. Notify me of new posts via email.