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.
adjective. Not in accordance with the political constitution or with procedural rules: they do not countenance unconstitutional action by the police the Act would be declared unconstitutional in the courts. More example sentences. 1  The law was later ruled unconstitutional by the Florida state Supreme Court.2  It led to the US supreme court ruling that the segregation of buses was unconstitutional. 3  First of all, the first declaration that you claim is that a certain High Court Rule is unconstitutional.ore example sentences. 1  The law was later ruled unconstitutional by the Florida state Supreme Court. 2  It led to the US supreme court ruling that the segregation of buses was unconstitutional. 3  First of all, the first declaration that you claim is that a certain High Court Rule is unconstitutional.