RETNLB and pulmonary arterial hypertension: Indeed, resistin-like molecule α (RELMα), also known as Found in Inflammatory Zone 1 (FIZZ1), or hypoxia-induced mitogenic factor (HIMF), belongs to a family of pro-inflammatory molecules that have been implicated in the development of PAH (8); however, the contributions of RELMα to RV failure are largely unknown.