For example, there are antibodies which only recognize certain proteins when they are tyrosine-phosphorylated, known as phospho-specific antibodies; also, there are antibodies specific to other modifications.
There are antibodies-phosphorylated-specific antibodies. This is for example. This is known as phospho. When they are tyrosine. This is what these antibodies recognize certain proteins. There are antibodies specific to other modifications. This is also.