Table 1. MXS-building blocks available from Addgene.

Addgene ID	Name	Short Description
Fluorescent Proteins with ATG start codon, no stop codon (excitation/emission maxima)
62400	MXS_TagBFP	399 nm/456 nm [17]
62401	MXS_Cerulean	433 nm/475 nm [18]
62402	MXS_LSS-mKate2	460 nm/605 nm [19]
62403	MXS_mEGFP	488 nm/507 nm [20]
62404	MXS_mAzamiGreen	492 nm/505 nm [21]
62405	MXS_Citrine	516 nm/529 nm [22]
62406	MXS_mKO2	551 nm/565 nm [5]
62407	MXS_tdTomato	554 nm/581 nm [23]
62408	MXS_mCherry	587 nm/610 nm [23]
62409	MXS_mPlum	590 nm/649 nm [24]
62410	MXS_E2-Crimson	611 nm/646 nm [25]
62411	MXS_iRFP670	645 nm/670 nm [26]
62412	MXS_PA-GFP	504 nm/517 nm after photoactivation [27]
62413	MXS_Kaede	508 nm/518 nm and 572 nm/582 nm [28]
Promoters and Enhancers
62414	MXS_PGK	PGK promoter [29]
62415	MXS_minPGK	minimal PGK promoter [30]
62416	MXS_PGKenhancer	PGK enhancer [30]
62417	MXS_CMV	CMV promoter [31]
62418	MXS_minCMV	minimal CMV promoter [31]
62419	MXS_CMVenhancer	508 nm/518 nm and 572 nm/582 nm [28]
62420	MXS_CAG	CAG promoter [32]
62421	MXS_EF1a	EF1α promoter [33]
62422	MXS_Tet	tetracycline-inducible promoter [6]
62423	MXS_BiTet	bidirectional tetracycline-inducible promoter [34]
Polyadenylation Signals
62424	MXS_bGpA	β-Globin poly A [35]
62425	MXS_bGHpA	bovine growth hormone poly A [36]
62426	MXS_SV40pA	Simian virus 40 poly A [37]
Tools for Inducible Gene Expression
62427	MXS_CreERT2	tamoxifen-inducible Cre recombinase [38]
62428	MXS_rtTA3	reverse tetracycline transactivator [39]
62429	MXS_tTA2	tetracycline transactivator [40]
Miscellaneous
62430	MXS_loxP	loxP site
62431	MXS_linker	12 aa long Gly-, Ser-rich linker
62432	MXS_H2B	histone 2B with leading Kozak sequence
62433	MXS_P2A	self-cleaving peptide [41]
62434	MXS_PEST2D	destabilization tag [42]