As noted earlier, the left and right chiral versions are related by a parity transformation. The skew complex conjugate ω ω ψ ψ ∗ ∗ = i σ σ 2 ψ ψ can be recognized as the charge conjugate form of ψ ψ . Thus, the Majorana equation can be read as an equation that connects a spinor to its charge-conjugate form. The two distinct phases on the mass term are related to the two distinct eigenvalues of the charge conjugation operator; see charge conjugation and Majorana equation for details.