Is the central channel of nuclear pore complex really the exclusive gateway for macromolecular transport?

Examination of many nuclear pore complexes revealed in some of them very thin filaments presumably RNA with accompanying proteins, directing from inner nucleus to the edge of the complex. On one representative micrograph it is shown that this strand continues in the same direction through central part of the complex most probably through the peripheral channel. Next route of the strand is through the tunnel of a hollow rod - subunit of the cytoplasmic ring.