The present invention relates to expression cassettes comprising transcription regulating sequences with constitutive expression profiles in plants obtainable from Arabidopsis thaliana genes At5g17920, At3g03780, At2g01100, At2g34770, At5g61560, At4g00830, At3g10220, At4g38520, At3g1111, At2g47170, At1g64090, At5g60690, At1g76350, At1g7650, At1g31930, At5g18230, At1g20970, or At4g35620.