As a detective solving the mystery of the crossword clue ‘immune system components’, I began by considering the different types of cells and molecules involved in the body’s defense against pathogens. The first word that came to mind was white blood cells, which play a crucial role in the immune response. I then recalled that T cells, or T lymphocytes, are a type of white blood cell that are responsible for recognizing and destroying infected or abnormal cells. This made T cells a strong candidate for the answer to the crossword clue. To confirm my suspicion, I then considered other possible answers, such as antibodies or natural killer cells, but these did not fit the length or structure of the clue. Finally, I realized that T cells were an ideal fit, as they are often referred to as “immune system components”, and are known to play a vital role in the body’s defense against infections and diseases. As such, T cells emerged as the clear answer to the crossword clue, offering both a satisfying conclusion to the mystery and a deeper understanding of the body’s complex immune system.