These compounds affect gene transcription by diffusing across the plasma membrane and causing receptor zinc-finger transcription factors to migrate into the nucleus.  They all have a cyclopentanophenanthrene nucleus, and in fungal cell membranes, some of these terpenoids act as precursors to vitamin D.  They are used to boost livestock production, maintain blood volume, and treat inflammatory and 
These compounds affect gene transcription by diffusing across the plasma membrane and causing receptor zinc-finger transcription factors to migrate into the nucleus.  They all have a cyclopentanophenanthrene nucleus, and in fungal cell membranes, some of these terpenoids act as precursors to vitamin D.  They are used to boost livestock production, maintain blood volume, and treat inflammatory and degenerative diseases such as asthma, arthritis, and AIDS wasting.  The hormones cortisol and progesterone are examples of, FTP, this class of compounds that all share the fused four carbon-ring structure of cholesterol, best known for their illegal bodybuilding effects.
These compounds affect gene transcription by diffusing across the plasma membrane and causing receptor zinc-finger transcription factors to migrate into the nucleus.  
steroids