“BioProbes 54,” the October 2007 issue of a newsletter published by !%Invitrogen Corp.%!, presents articles on the company’s new technologies, including the TC-FlAsH TC-ReAsH protein detection technology and the Click-iT EdU products for more accurate cell proliferation data. Sections on practical applications address areas such as quantum dots as replacements for tandem dyes in flow cytometry, fluorescent calcium indicators for in vivo imaging of neuronal networks, and identifying Alzheimer’s disease biomarkers from human brain tissue. The use of quantum dot nanocrystals in flow cytometry also is discussed. Available in pdf or in print, the 32-page document includes photographs, charts and diagrams, and a section on new Web tools.