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may be more explicitly canalized under genotypic control. Nucleotide substitution might still play a role here by modifying the level of activity rather than the specificity of neighboring loci, and elective recognition of transient states spontaneously derived then remains as a formal, if farfetched, possibility for other morphogenetic inductions. ReCerences and Notes 1. This definition excludes antibody-like substances such as the heniagglutinins found in normal human sera. These reagents dodoi:10.1126/science.129.3364.1653 pmid:17749235 fatcat:sb6y224ykba2fdbmgnschvyema