Although bacteria frequently live as unicellular organisms, many spend at least part of their
lives in complex communities, and some have adopted truly multicellular lifestyles and have …

The green lineage of chlorophyte algae and streptophytes form a large and diverse clade
with multiple independent transitions to produce multicellular and/or macroscopically …

The G-protein-coupled receptor (GPCR) signaling system is one of the main signaling
pathways in eukaryotes. Here, we analyze the evolutionary history of all its components …

Background The molecular history of animal evolution from single-celled ancestors remains
a major question in biology, and little is known regarding the evolution of cell cycle …

The rise of multicellularity represents a major evolutionary transition and it occurred
independently in multiple eukaryote clades. Although simple multicellular organisms may …

Kim Sterelny and Daniel McShea for helpful comments and suggestions on earlier papers
on the topic that I also included within the present work. Kristian Köchy for a series of …

Animals evolved in seas teeming with bacteria, yet the influences of bacteria on animal
origins are poorly understood. Comparisons among modern animals and their closest living …

An 'evolutionary transition in individuality'or 'major transition'is a transformation in the
hierarchical level at which natural selection operates on a population. In this article I give an …

The evolution of multicellular life from unicellular ancestral types involves a hierarchical shift
in the level at which selection operates. The shift, from cells to collectives, depends on the …

In this paper we explore the organizational conditions underlying the emergence of
organisms at the multicellular level. More specifically, we shall propose a general theoretical …