Stem cells are cells that have the potential to develop into many different types of cell in the body including red blood cells (erythrocytes), white blood cells (leukocytes) as well as platelets (thrombocytes). Stem cells are formed in bone marrow and also in blood.
Stem cells usually come from two main sources: embryos and adult tissue. Embryonic stem cells can multiply and differentiate and ultimately form the entire organism whereas adult stem cells are generally thought to have limited ability to differentiate based on their tissue of origin. They are able to regenerate cells from their original organ.

(Also called Coronavirus or SARS-Cov 2) An infectious disease caused by a newly discovered coronavirus in 2019. Most people infected with the COVID-19 virus experience mild to moderate respiratory illness and recover without requiring special treatment. Older people and those with underlying medical problems like cardiovascular disease, diabetes, chronic respiratory disease, and cancer, are more likely to develop serious illness.

Chronic Myeloid Leukemia, also called Chronic Myelogenous Leukemia
A chronic disease of the blood and bone marrow that results from a transformation of a stem cell.

Abbreviation for Treatment-Free Remission. In CML is referred to having a stable deep molecular response without the need for ongoing Tyrosine Kinase Inhibitor (TKI) treatment after having been in deep molecular residual disease over a longer period of time.