reference preparation造句

Working with colleagues there they purified these hormones and later developed the International Standard Reference Preparation facilitating their widespread usage.
The study is performed using highly purified preparations of the substance, typically in lyophilized form, called " international reference preparations " or IRPs.
Many biological agents exist in different forms or preparations ( e . g . vitamin A in the form of retinol or Expert Committee on Biological Standardization provides a reference preparation of the agent, arbitrarily sets the number of IUs contained in that preparation, and specifies a biological procedure to compare other preparations of the same agent to the reference preparation.
Many biological agents exist in different forms or preparations ( e . g . vitamin A in the form of retinol or Expert Committee on Biological Standardization provides a reference preparation of the agent, arbitrarily sets the number of IUs contained in that preparation, and specifies a biological procedure to compare other preparations of the same agent to the reference preparation.
It's difficult to find reference preparation in a sentence. 用reference preparation造句挺难的