  The light-quark sector of the Lambda(1405) baryon is examined in the context
of the recent discovery of a dominant antikaon-nucleon composition at low quark
masses. Further evidence for this interpretation of the Lambda(1405) is
presented, by calculating the u and d quark contributions to the Lambda(1405)
magnetic form factors in lattice QCD. The extent to which these quantities are
consistent with the exotic molecular description can then be quantified by
comparing the results with the equivalent nucleon form factors. Drawing on a
recent extension of the graded-symmetry approach for the flavor-singlet
components of the Lambda(1405), the separation of the connected and
disconnected contributions is performed in both the flavor-octet and singlet
representations. In both cases, the disconnected loop contributions are found
to be unexpectedly large. The relationship between the light-quark
contributions to the Lambda(1405) magnetic form factor and the connected
contributions of the nucleon magnetic form factors is thus confirmed in the
case of lattice QCD, establishing compelling evidence for a KN molecular
structure of the Lambda(1405) near the physical point.
