the aspartate-induced methylation on the serine receptor is absent in a strain that lacks chea and chew genes and is not the result of physical interaction , such as the formation of heterodimers between the aspartate and serine receptors , or of alterations in the affinity of the serine receptor for the methyltransferase and the methylesterase .
C0025723
methylation
C0025831
methyltransferase