/euh kray"sin/ , n. Mycol.
a chemotactic substance, identical with cAMP, secreted by myxamebas of cellular slime molds and attracting other myxamebas to aggregate and form a pseudoplasmodium.
[ 1945-50; Acras ( iales ) an order of cellular slime molds ( Acras ( is ) a genus, so named from the lack of fusion between the cells ( 6 , CRASIS) + -ales -ALES) + -IN 2 ]