Tretinoin was co-developed for its use in acne by James Fulton and Albert Kligman when they were at University of Pennsylvania in the late 1960s. The University of Pennsylvania held the patent for Retin-A, which it licensed to pharmaceutical companies.
/ËÊnËkÉËnstÉËtuËÊÉnlÌ/ /ËÊnËkÉnstÉËtjuËÊÉnlÌ/. adjective. Learner's definition of UNCONSTITUTIONAL. : not allowed by the constitution of a country or government: not constitutional.ËÊnËkÉËnstÉËtuËÊÉnlÌ/ /ËÊnËkÉnstÉËtjuËÊÉnlÌ/. adjective. Learner's definition of UNCONSTITUTIONAL. : not allowed by the constitution of a country or government: not constitutional.
An act (or statute) enacted as law either by a national legislature or by the legislature of a subordinate level of government (such as a state or province) may be declared unconstitutional. However, governments do not just create laws.