The word respectively is usually not needed…but sometimes, it’s really not needed. Here’s an example:

We identified three genomic regions, centered on the ERBB3, SH2B3 and LYZ-YEATS4 genes respectively, that were associated to expression patterns.

Not sure what it adds here…

We examined seven histone H3 modifications (H3K4me1, me2, me3, K36me3, K27me3, K9me3 and K20me3); data (see URLS for the data source) that represent different types of chromatin activities from mouse ES cells in the loops and compared their signal intensities with those from immediately outside the loops (to the left and to the right, respectively).