So far, how many MYB genes have officially landed in CNBI?

What you want to ask is how many MYB genes have officially landed in NCBI so far, and there are currently more than 500 annotations.

National Biotechnology Information Center (NCBI) is a part of National Library of Medicine (NLM), which is a part of National Institutes of Health.

NCBI is located in Bethesda, Maryland, and was founded in 1988. NCBI keeps the gene sequencing data of GenBank and the index of biomedical research papers of Medline. All these databases can be accessed online through the Entrez search engine.