VIL1 and microvillus inclusion disease: Utilizing the MVID model mice Vil1-CreERT2;Myo5bflox/flox (MYO5BΔIEC) and Vil1-CreERT2;Myo5bflox/G519R [MYO5B(G519R)], we previously reported that functional MYO5B loss disrupts progenitor cell differentiation and enterocyte maturation that result in villus blunting and deadly malabsorption symptoms.