I was trying to use readMicroRnaAFE() function of AgiMicroRna packge. However, one of the required columns for readMicroRnaAFE() was missing from the raw data. Afterwards I used read.maimage() function of limma package to read the file. The problem is that read.maimage() outputs an RGList object but I need to convert it to uRNAList object in order to continue downstream analyses with AgiMicroRna package. I would appreciate any help.