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I&I 21 Y-DNA haplogroup compositon ~

Iyer: (J2a, R1a1, R1a1, L1, L1, R2, J2b2, L1, H1, R1a1, G2, R*, L1, R2, L1, J2a, R1a1, R1a1, R2, G2, C5, J2a, G2, R1a1, H, R1a1, C5, J2a, R1a1)

Iyengar: (R1a1, R1a1, R2, R1a1, R2, R1a1, H1, J2a1e, H1, R1a1, R2, R1a1, R1a1, J2a, G2, L1, R1a1, L1, J2a, J2b2, L1, J2a, R1a1, G2, H1, G2, J2a, L1, L1, G2).

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Iyer: (Dravidian speaking Brahmin)
2/29 = 6.9% C5-M356
3/29 = 10.3% G2a-P15
1/29 = 3.4% H-M69
1/29 = 3.4% H1-M52
4/29 = 13.8% J2a-M410
1/29 = 3.4% J2b2-M241
5/29 = 17.2% L1-M76
1/29 = 3.4% R*-M207
8/29 = 27.6% R1a1a-M17
3/29 = 10.3% R2-M124

Iyengar: (Dravidian speaking Brahmin)
4/30 = 13.3% G2a-P15
3/30 = 10.0% H1-M52
4/30 = 13.3% J2a-M410
1/30 = 3.3% J2a1d-M158
1/30 = 3.3% J2b2-M241
5/30 = 16.7% L1-M76
9/30 = 30.0% R1a1a-M17
3/30 = 10.0% R2-M124

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Sengupta et al Y-DNA haplogroup frequency among Southern castes.

I think 'middle castes' must refer to Vaishyas and socially dominant Shudras, but really there is no middle caste as per the sacred texts as there is only dwija/twice born.