PPBP (human)      LTP 

LTP (Low Throughput Papers) : The number of records in which this modification site was determined using methods other than discovery mass spectrometry.

 HTP 

HTP (High Throughput Papers): The number of records in which this modification site was assigned using ONLY proteomic discovery mass spectrometry.

 
S52-p
LAKGKEEsLDSDLyA
0 4
PPBP (human) LAKGKEEsLDSDLyA S52-p
Y58-p
EsLDSDLyAELRCMC
0 9
PPBP (human) EsLDSDLyAELRCMC Y58-p