Abstract
Two analogues of bovine β-casomorphin-7 and β-casomorphin-5 containing a β-homo phenylalanine in substitution of the phenylalanine in position 3 were synthesised and tested for their μ-opioid receptor affinity. The modification enhanced the μ receptor affinity 5-fold in the case of modified β-CM-7 and 2-fold for modified β-CM-5 when compared to the natural peptides.
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