The present invention provides a primary cell culture which combines a cell culture medium and cells derived from a hypertrophied androgenic gland (AG) of a decapod crustacean. The invention also provides methods for obtaining an all-female progeny by initially injecting/transplanting the primary cell culture to a genetic-female to obtain a male-Neo-male.

Provided herein are methods of producing trabecular bone material, such as trabecular bone or trabecular bone matrix and cells useful in preparing the trabecular bone material.

Methods and compositions are provided for generating targeted genetic modifications on the Y chromosome or a challenging target locus. Compositions include an in vitro culture comprising an XY pluripotent and/or totipotent animal cell (i.e., XY ES cells or XY iPS cells) having a modification that decreases the level and/or activity of an Sry protein; and, culturing these cells in a medium that promotes development of XY F0 fertile females. Such compositions find use in various methods for making a fertile female XY non-human mammal in an F0 generation.

Methods and compositions are provided for generating targeted genetic modifications on the Y chromosome or a challenging target locus. Compositions include an in vitro culture comprising an XY pluripotent and/or totipotent animal cell (i.e., XY ES cells or XY iPS cells) having a modification that decreases the level and/or activity of an Sry protein; and, culturing these cells in a medium that promotes development of XY F0 fertile females. Such compositions find use in various methods for making a fertile female XY non-human mammal in an F0 generation.

Genetically modified mammals are described which lack the mannan binding lectin associated serine protease MASP-2, together with methods and constructs for their production. Such mammals are useful as models for disorders of the complement system, and in the identification of treatments for such disorders. Also described are mammals which lack the associated protein MAp19; such mammals may also lack MASP-2.