Unique and shared peptides from Arabidopsis PIP (plasma membrane Intrinsic protein) aquaporin isoforms and their relative abundance in leaf and root plasma membranes (q-value).

aPeptide sequences for which reliable 14N/15N spectra could be obtained.
bThe q-value is a measure of the distribution of the peptide between root and leaf plasma membranes: A q-value of 1 means that the peptide is found in roots only; 0, in leaves only. SD is the standard deviation for the q-value of the peptide based on all spectra containing the 14N/15N peptide pair for that specific peptide.
cNumber of MS spectra containing reliable data for the 14N/15N peptide pair used to determine the q-value. All these spectra have fulfilled all criteria for that specific peptide/protein, including correct position of the protein on the SDS-gel, consistent elution of the peptide in the nano-LC gradient, and correct peptide molecular mass as well as isotopic pattern.
dGenevestigator data for mRNA distribution between Arabidopsis leaf rosettes and roots converted to a simple letter code: L, mRNA found in leaves only, R, in roots only; LR, about equally distributed between leaves and roots; Lr, mainly in leaves; lR, mainly in roots.