Indicate true (T) and false (F) statements below regarding the ubiquitin ligase c-Cbl. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTF. ( ) It contains an SH2 domain, and can therefore activate RTK signaling. ( ) It ubiquitylates activated RTKs. ( ) Its overactivation can lead to prolonged RTK signaling and promote the development of cancer. ( ) It is part of a negative feedback loop to down-regulate RTKs.