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DNA Lesson: Y-DNA STR Testing
To trace your paternal ancestry using Y-DNA STR markers
Y-DNA 20, 44, 67, 91 or 101 STR Marker Test for paternal ancestry
All living things, including humans, are made up of cells. Humans are made up of many different kind of cells, including skin cells, blood cells, buccal cells (inside the mouth), muscle cells, fat cells, and many more.