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Immunoblots of CsCl density gradient fractions for purification of empty virus capsids after transfection of the mature capsid protein gene (A) or the capsid protein precursor gene (B). The densities of the respective fractions are indicated at the top. (C) Immunoblot of fraction 5 from both gradients along with purified virions separated in an SDS–10% PAGE gel and detected with FCV MAb K to indicate the size homologies of the respective capsid proteins.
