An immunological cross reaction between monkey gonadotrophin preparations and antisera to human gonadotrophins.

There is still some confusion about the ability of monkey and human gonadotrophins to cross react in immunological systems. McGarry & Beck (1963), using a haemagglutination inhibition technique, found a cross reaction between antisera to human fsh and monkey fsh. They also found a similar cross reaction with lh. Neill, Peckham & Knobil (1967), Bagshawe, Orr & Godden (1968) and Faiman, Ryan, Greslin & Reichert (1967), using radioimmunoassays, were unable to show a cross reaction between monkey preparations and antisera to human gonadotrophins, while Tullner, Rayford & Ross (1969), using an anti-