artistic artisticphotography camera celldifferentiation celldivision cellularcontrolmechanisms color crystalline crystallinelens cytology evolution exposure fixedlens focallength geneexpression genetics image imageediting images markgaler metabolism molecularaspects newts photographer photographic photography photoshop photoshopelements physiology practicalassignment regeneration regeneration(biology) shutterspeed shutterspeeds subject subjectmatter urodela vantagepoint ww260w817m1995