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The J2a lines are mostly long narrow lines. The L70-branches are part of L25. These branches are present in the region from Saudi Arabia to North Middle East to the Mediterranean.
L70 has several significant STR-mutations in the yfull period 6600-3700 ybp (DYS19=15, DYS391=9, DYS388=16, DYS437=14, Y-GATA-H4=11, DYS442=12), DYS458=14 mutated at the period of marker Z2148 (3400 ybp, yfull). This means that the 10 branches are likely well defined. Their distances between each other are significant, so likely real branches.
The M92 have very low percentages in Arabian countries, but larger in the north of the Middle East. M319 is an old line in the Middle East.
The largest amount of information on J2 is found on J2-M172 Haplogroup Research.
A tree with time estimates is found on yfull.
The groups below are grouped in older branches (the indicated times are the best estimated branchsplits according to yfull):
List of SNPs in yfull tree:Home - A0-T - A1 - A1b - BT - CT - CF - F - GHIJK - HIJK - IJK - IJ - J - J2 - M410