1 P15502-ELN_HUMAN. 2  Hydroxylation on proline residues within the sequence motif, GXPG, is most likely 4-hydroxy as this fits the requirement for 4-hydroxylation in vertebrates.
An API number is a unique and permanent number that identifies each well drilled for oil and gas in the United States. API numbers were established by the American Petroleum Institute, as an industry standard, to keep track of the nearly three million oil and gas drills in the country. It was necessary because wells usually have names that consist of three parts: an operator name, a well number and a lease name.
Application Programming Interface - API. DEFINITION of 'Application Programming Interface - API'. An interface or go-between that enables a software program to interact with other software. In the context of forex trading, an API refers to the interface or platform that enables your platform to connect with the market. APIs have multiple features that facilitate information sharing, including real-time forex price quotations, trade execution and order and trade confirmations.