Orange.data.Variable: use Registry metaclass
Orange.data.Variable: use Registry metaclass

qPCR4vir/orange3,marinkaz/orange3,kwikadi/orange3,cheral/orange3,qPCR4vir/orange3,kwikadi/orange3,marinkaz/orange3,cheral/orange3,kwikadi/orange3,qPCR4vir/orange3,qPCR4vir/orange3,cheral/orange3,qPCR4vir/orange3,cheral/orange3,cheral/orange3,marinkaz/orange3,marinkaz/orange3,marinkaz/orange3,cheral/orange3,kwikadi/orange3,kwikadi/orange3,marinkaz/orange3,qPCR4vir/orange3,kwikadi/orange3