text: For more  "light" quark species,   flavors  in general, the corresponding chiral symmetries are ,  decomposing into
  and exhibiting a very analogous chiral symmetry breaking pattern.
  Most usually,  is taken, the u, d, and s quarks taken to be light (the eightfold way), so then approximately massless for the symmetry to be meaningful to a lowest order, while the other three quarks are sufficiently heavy to barely have a residual chiral symmetry be visible for practical purposes.