Carcinoma Cuniculatum, a Rare Variant of Oral Squamous Cell Carcinoma: Presentation of Five Clinical Cases and Review of the Literature.

Background: Oral carcinoma cuniculatum (CC) is a rare variant of squamous cell carcinoma. It exhibits a locally aggressive behaviour, and its histopathology poses a diagnostic challenge, as it can be mistaken for other conditions. We present five cases of oral CC treated at our institution and conduct a comprehensive review of the current literature.

The anatomy of abscission zones is diverse among grass species.

Premise: Abscission zones (AZ) are specialized cell layers that separate plant parts at the organ junction upon developmental or environmental signals. Fruit or seed abscission has been well studied in model species because of its crucial role for seed dispersal. Previous work showed that AZ localization differs among species of Poaceae and that AZ formation is histologically and genetically distinct in three distantly related grass species, refuting the idea of a broadly conserved module.