Incremental changes in expression of RP transcripts evoked by long-term treatment with NGF. NGF-promoted changes in expression of RP transcripts are given in incremental units. Up-regulated transcripts are given as [(number of normalized tag numbers + NGF/number of normalized tag numbers - NGF) - 1] and are thus expressed as positive values. Transcripts that are down-regulated by NGF are given as –[(number of normalized tag numbers - NGF/number of normalized tag numbers + NGF) - 1] and are thus expressed as negative values. For transcripts that do not change expression in response to NGF, the incremental change is zero. A. Transcripts for RP L3-L41 and P0-P2. B. Transcripts for RP S2-S30 and 40 KD RP.