hematine

例句：

1. 1. Hematine is a naturally occurring pigment found in red blood cells.
   血红素是一种存在于红血细胞中的天然色素。
2. 2. The hematine molecules are responsible for the red color of blood.
   血红素分子负责血液的红色。
3. 3.The discovery of hematine has led to new treatments for anemia.
   发现血红素导致了新的治疗贫血的方法。