HARRISON, HARRESON, HARISON, HARRISEN, and any other reasonable spelling variations are welcome to join the project. Only males have Y-chromosomes, so only a male HARRISON (or variant spellings) can participate. If you are female, you can have a male HARRISON (or variations) relative submit a sample for your line. To participate meaningfully, you will need to share your direct male line ancestry back to the earliest known Harrison in the form of a pedigree chart (excluding living persons). We have established a number of distinct Harrison lines, and we welcome your participation in this important project!