Examples of pin loss-of-function phenotypes. (a-d, f) pin1 mutants can have (a) fused leaves, (b) pin-like inflorescence, (c, d) defective flowers and (f) three cotyledons in the seedling. (e) pin2 mutant showing agravitropic root growth. (g) Fused, cup-shaped cotyledons of triple-mutant pin1,3,4 seedling. (h) No apical-basal patterning in a triple-mutant pin1,3,4,7 embryo.