How did the Nazi medical experiments and the Tuskegee Syphilis Study influence the ethics of human and animal studies?

How did the Nazi medical experiments and the Tuskegee Syphilis Study influence the ethics of human and animal studies? Read “The Nuremburg Code” on page 302 of the textbook. Discuss your thoughts on the elements of the code. Is it complete, or are there other aspects of the ethics of human testing that should be included?