Breast cancers that are positive for estrogen receptor (ER) and negative for human epidermal growth factor receptor 2 (HER2) (hereafter referred to as ER-positive) are the most common subset of breast ...

There are two main types of bacteria, and these categories reflect the microbes' biology and their vulnerability to different antibiotics. When you purchase through links on our site, we may earn an ...

There are many ways of classifying bacteria. One method is based on the cell membrane. In 1884, a bacteriologist named Christian Gram created a test that could determine if a bacterium had a thick, ...