EST, microarray, RNAseq difference?

[dkrtndhkd]

I want to know the difference of EST, microarray, RNAseq.

this is my conclusion;

through EST, we can know the sequence of transcripts from each cell type,
and from the result of EST, we can make microarray platform and find the expression level of transcription.
and, RNA seq can do both transcript sequence and expression level.

am I right?

[westerman]

That would be correct. EST leads to sequence which leads to microarrays which leads to expression levels. Whereas rnaSeq combines both steps.